fix: Fix MSVC warnings #1574

Job	Run time
host_win_msvc	1m 21s
host_arm (armv7, none, g++-10)	5m 47s
host_arm (armv7, none, clang++-11)	3m 22s
host_arm (aarch64, none, g++-10)	2m 42s
host_x86 (x86_64, g++-10)	2m 55s
host_win (x86_64)	1m 4s
host_arm (aarch64, none, clang++-11)	4m 31s
host_x86 (x86_64, clang++-11)	19s
host_win (armv7)	1m 9s
host_win (aarch64)	1m 2s
host_arm (aarch64, crypto+crc, g++-10)	3m 27s
coding_style	18s
host_arm (aarch64, crypto+crc, clang++-11)	3m 26s
test_win_msvc	56s
	32m 19s

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