asm sources can't be compiled when Qt configured with -pch (default)

Qt 5 doesn't compile for ARM targets with the default configuration, because the make rule for .S files is the same as for .c files.
This is normally not a problem, but the precompiled header is not valid for .S files.

When using gcc, the compilation command looks like this:
gcc -c -include .pch/release-shared/Qt5Gui .... qdrawhelper_neon_asm.S

And that results in a compile error as .pch/release-shared/Qt5Gui does not exist.
The file .pch/release-shared/Qt5Gui.gch does exist but is only valid for c/c++ source files.

Possibly qmake requires a different section rather than SOURCES to put assembly files.
Or it can split them out with different CFLAGS used as it does for .c vs .cpp files.

Workaround:
configure -no-pch