Merge pull request #642 from howjmay/test-opt #304

Job	Run time
host-x86 (x86_64, g++-10)	1m 59s
host-x86 (x86_64, clang++-11)	23s
coding-style	14s
host-win (x86_64)	53s
host-arm (armv7, none, none, g++-10)	3m 27s
host-win (armv7)	40s
host-win (aarch64)	47s
host-arm (armv7, none, none, clang++-11)	3m 40s
host-win-msvc	1m 22s
host-arm (aarch64, none, none, g++-10)	3m 1s
host-arm (aarch64, none, none, clang++-11)	3m 29s
host-arm (aarch64, crypto+crc, none, g++-10)	2m 47s
host-arm (aarch64, crypto+crc, none, clang++-11)	3m 27s
host-arm (armv7, none, -mcpu=cortex-a32 -mfpu=neon-fp-armv8, g++-10)	3m 16s
host-arm (armv7, none, -mcpu=cortex-a32 -mfpu=neon-fp-armv8, clang++-11)	3m 27s
test-win-msvc	50s
	33m 42s

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