Compilation with NDK r21 fails in qfloat16.cpp on undeclared identifier 'vcvt_f16_f32'

/<...>/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -c -Xclang -include-pch -Xclang .pch/armeabi-v7a/Qt5Core_armeabi-v7a.pch/c++.pch -target armv7a-linux-androideabi21 -fno-limit-debug-info -fPIC -fstack-protector-strong -DANDROID -O2 -mthumb -Oz -std=c++1z -fvisibility=hidden -fvisibility-inlines-hidden -Wall -W -Wdate-time -Winconsistent-missing-override -D_REENTRANT -fPIC -DQT_NO_LINKED_LIST -DQT_NO_JAVA_STYLE_ITERATORS -DLIBS_SUFFIX=\"_armeabi-v7a.so\" -DQT_NO_USING_NAMESPACE -DQT_NO_FOREACH -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_BUILD_CORE_LIB -DQT_BUILDING_QT -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_DEPRECATED_WARNINGS_SINCE=0x060000 -DQT_NO_DEBUG -DPCRE2_CODE_UNIT_WIDTH=16 -I/<...>/qt-everywhere-src-5.14.0/qtbase/src/corelib -I. -Iglobal -I/<...>/qt-everywhere-src-5.14.0/qtbase/src/3rdparty/md5 -I/<...>/qt-everywhere-src-5.14.0/qtbase/src/3rdparty/md4 -I/<...>/qt-everywhere-src-5.14.0/qtbase/src/3rdparty/sha3 -I/<...>/qt-everywhere-src-5.14.0/qtbase/src/3rdparty -I/<...>/qt-everywhere-src-5.14.0/qtbase/src/3rdparty/double-conversion/include -I/<...>/qt-everywhere-src-5.14.0/qtbase/src/3rdparty/harfbuzz/src -I/<...>/qt-everywhere-src-5.14.0/qtbase/src/3rdparty/forkfd -I/<...>/qt-everywhere-src-5.14.0/qtbase/src/3rdparty/tinycbor/src -I/<...>/qt-everywhere-src-5.14.0/qtbase/include -I/<...>/qt-everywhere-src-5.14.0/qtbase/include/QtCore -I../../include -I../../include/QtCore -I/<...>/qt-everywhere-src-5.14.0/qtbase/include/QtCore/5.14.0 -I/<...>/qt-everywhere-src-5.14.0/qtbase/include/QtCore/5.14.0/QtCore -I../../include/QtCore/5.14.0 -I../../include/QtCore/5.14.0/QtCore -I.moc/armeabi-v7a -I.tracegen/armeabi-v7a -I/<...>/qt-everywhere-src-5.14.0/qtbase/src/3rdparty/pcre2/src -I/<...>/openssl-1.1.1d-r20b-api22-aarch64/include -I/<...>/qt-everywhere-src-5.14.0/qtbase/mkspecs/android-clang -o .obj/armeabi-v7a/qfloat16.o /<...>/qt-everywhere-src-5.14.0/qtbase/src/corelib/global/qfloat16.cpp
/<...>/qt-everywhere-src-5.14.0/qtbase/src/corelib/global/qfloat16.cpp:219:31: error: use of undeclared identifier 'vcvt_f16_f32'
        vst1_f16(out_f16 + i, vcvt_f16_f32(vld1q_f32(in + i)));
                              ^
/<...>/qt-everywhere-src-5.14.0/qtbase/src/corelib/global/qfloat16.cpp:229:41: error: use of undeclared identifier 'vld1_f16'
        vst1q_f32(out + i, vcvt_f32_f16(vld1_f16(in_f16 + i)));
                                        ^
2 errors generated.
Makefile.Armeabi-v7a:12775: recept voor doel '.obj/armeabi-v7a/qfloat16.o' is mislukt
make[4]: *** [.obj/armeabi-v7a/qfloat16.o] Fout 1
make[4]: Map '/<...>/qt-5.14.0/qtbase/src/corelib' wordt verlaten
Makefile:48: recept voor doel 'armeabi-v7a-all' is mislukt
make[3]: *** [armeabi-v7a-all] Fout 2
make[3]: Map '/<...>/qt-5.14.0/qtbase/src/corelib' wordt verlaten
Makefile:228: recept voor doel 'sub-corelib-make_first' is mislukt
make[2]: *** [sub-corelib-make_first] Fout 2
make[2]: Map '/<...>/qt-5.14.0/qtbase/src' wordt verlaten
Makefile:50: recept voor doel 'sub-src-make_first' is mislukt
make[1]: *** [sub-src-make_first] Fout 2
make[1]: Map '/<...>/qt-5.14.0/qtbase' wordt verlaten
Makefile:86: recept voor doel 'module-qtbase-make_first' is mislukt
make: *** [module-qtbase-make_first] Fout 2