Fix tests build (musl + clang >=15), fix a warning, fix cfi #772

Job	Run time
build (linux-gcc)	9m 21s
build (linux-clang)	9m 41s
build (macos)	1m 16s
build (linux-i686-gcc)	8m 32s
build (android)	35s
build (windows-cygwin-64)	12m 47s
build (windows-cygwin-32)	10m 7s
build (windows-msys2-64)	10m 25s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	38s
	1h 3m 22s

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