operand type mismatch for `shr in mathops.h - build fails

building qtwebengine from release tarball

previous 6.5.2 built ok

build failed to find my system copy of ffmpeg-5.1.3 and tries to build a bundled version.

```
[5647/29952] CC obj/third_party/ffmpeg/ffmpeg_internal/flac.o
FAILED: obj/third_party/ffmpeg/ffmpeg_internal/flac.o
/var/lib/sorcery/build/cc -MMD -MF obj/third_party/ffmpeg/ffmpeg_internal/flac.o.d -DHAVE_AV_CONFIG_H -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -DFFMPEG_CONFIGURATION=NULL -DCHROMIUM_NO_LOGGING -D_ISOC99_SOURCE -D_LARGEFILE_SOURCE -DUSE_UDEV -DUSE_AURA=1 -DUSE_OZONE=1 -DOFFICIAL_BUILD -DTOOLKIT_QT -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -DNO_UNWIND_TABLES -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -I../../../../../src/3rdparty/chromium/third_party/ffmpeg/chromium/config/Chromium/linux/x64 -I../../../../../src/3rdparty/chromium/third_party/ffmpeg -Igen -I../../../../../src/3rdparty/chromium -fPIC -Wno-deprecated-declarations -fomit-frame-pointer -w -std=c99 -pthread -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -fno-ident -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -Wno-unknown-pragmas -Wno-address -Wno-parentheses -Wno-sign-compare -Wno-stringop-overflow -Wno-stringop-overread -Wno-psabi -Wno-multichar -Wno-format-zero-length -fno-unwind-tables -fno-asynchronous-unwind-tables -fPIC -pipe -pthread -m64 -msse3 -g0 -fvisibility=hidden -Wno-unused-local-typedefs -Wno-maybe-uninitialized -Wno-deprecated-declarations -fno-delete-null-pointer-checks -Wno-comments -Wno-packed-not-aligned -Wno-dangling-else -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi -O2 -fdata-sections -ffunction-sections -I/usr/include/opus -std=gnu11 -c ../../../../../src/3rdparty/chromium/third_party/ffmpeg/libavcodec/flac.c -o obj/third_party/ffmpeg/ffmpeg_internal/flac.o
../../../../../src/3rdparty/chromium/third_party/ffmpeg/libavcodec/x86/mathops.h: Assembler messages:
../../../../../src/3rdparty/chromium/third_party/ffmpeg/libavcodec/x86/mathops.h:125: Error: operand type mismatch for `shr'

d# lshw -c cpu
*-cpu
description: CPU
product: AMD Ryzen 5 2600 Six-Core Processor
vendor: Advanced Micro Devices [AMD]
physical id: 2a
bus info: cpu@0
version: AMD Ryzen 5 2600 Six-Core Processor
serial: Unknown
slot: AM4
size: 1374MHz
capacity: 3900MHz
width: 64 bits
clock: 100MHz
capabilities: lm fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp x86-64 constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb hw_pstate ssbd ibpb vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif overflow_recov succor smca sev sev_es cpufreq
configuration: cores=6 enabledcores=6 threads=12

CXX=-march=native -mtune=native -m64 -pipe -O3
INSTALL_PREFIX=/opt/qt6
– The C compiler identification is GNU 13.2.0
– The CXX compiler identification is GNU 13.2.0
– Detecting C compiler ABI info
– Detecting C compiler ABI info - done
– Check for working C compiler: /var/lib/sorcery/build/cc - skipped
– Detecting C compile features
– Detecting C compile features - done
– Detecting CXX compiler ABI info
– Detecting CXX compiler ABI info - done
– Check for working CXX compiler: /var/lib/sorcery/build/c++ - skipped
– Detecting CXX compile features
– Detecting CXX compile features - done
– Performing Test CMAKE_HAVE_LIBC_PTHREAD
– Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
– Check if compiler accepts -pthread
– Check if compiler accepts -pthread - yes
– Found Threads: TRUE
– Performing Test HAVE_STDATOMIC
– Performing Test HAVE_STDATOMIC - Success
– Found WrapAtomic: TRUE
– Found OpenGL: /usr/lib/libGL.so
– Checking 'ulimit -n'
– Open files limit 4096

– Configuration summary shown below. It has also been written to /build/qtwebengine-everywhere-src-6.5.3/build/c
onfig.summary
– Configure with --log-level=STATUS or higher to increase CMake's message verbosity. The log level does not pers
ist across reconfigurations.

– Configure summary:

WebEngine Repository Build Options:
Build Ninja ............................ no
Build Gn ............................... yes
Jumbo Build ............................ yes
Developer build ........................ no
Build QtWebEngine Modules:
Build QtWebEngineCore ................ yes
Build QtWebEngineWidgets ............. yes
Build QtWebEngineQuick ............... yes
Build QtPdf Modules:
Build QtPdfWidgets ................... yes
Build QtPdfQuick ..................... yes
Optional system libraries:
re2 .................................. yes
icu .................................. no
libwebp, libwebpmux and libwebpdemux . yes
opus ................................. yes
ffmpeg ............................... no
libvpx ............................... yes
snappy ............................... yes
glib ................................. yes
zlib ................................. yes
minizip .............................. no
libevent ............................. yes
libxml2 and libxslt .................. yes
lcms2 ................................ yes
png .................................. yes
jpeg ................................. yes
libopenjpeg2 ......................... yes
harfbuzz ............................. yes
freetype ............................. yes
libpci ............................... yes
Qt WebEngineCore:
Embedded build ......................... no
Full debug information ................. no
Sanitizer support ...................... no
Pepper Plugins ......................... yes
Printing and PDF ....................... yes
Proprietary Codecs ..................... no
Spellchecker ........................... yes
WebRTC ................................. yes
PipeWire over GIO ...................... no
Geolocation ............................ yes
WebChannel support ..................... yes
Kerberos Authentication ................ no
Extensions ............................. yes
Support GLX on qpa-xcb ................. yes
Vulkan support ......................... yes
Use ALSA ............................... yes
Use PulseAudio ......................... no
Qt WebEngineQuick:
UI Delegates ........................... yes
Qt PDF:
Support V8 ............................. no
Support XFA ............................ no
Support XFA-BMP ........................ no
Support XFA-GIF ........................ no
Support XFA-PNG ........................ no
Support XFA-TIFF ....................... no
Bitcode support ........................ no
Use static runtime ..................... no

```