C++

Fix unnecessary/restrictive public target flags #1554

Job	Run time
windows-latest	19m 54s
ubuntu-22-04-gcc-default-cmake-3-17-ffmpeg5	26m 16s
ubuntu-22-04-ffmpeg701	1m 14s
ubuntu-latest-gcc-11-blas	15m 51s
ubuntu-22-04-ffmpeg711	1m 26s
ubuntu-latest-clang-default-avx	16m 42s
	1h 21m 23s

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