Add `set_cert_verify_callback` (`SSL_CTX_set_cert_verify`) #939

Job	Run time
rustfmt	12s
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	1m 54s
Cross build from macOS to Linux (FIPS) (x86_64-unknown-linux-gnu)	3m 16s
clippy	3m 37s
Test features	7m 29s
Test FIPS integration	3m 6s
Test (stable)	2m 11s
Test (arm-android)	2m 21s
Test (arm64-android)	2m 41s
Test (i686-android)	2m 4s
Test (x86_64-android)	2m 0s
Test (aarch64-ios)	2m 23s
Test (aarch64-ios-sim)	3m 25s
Test (x86_64-ios)	2m 17s
Test (i686-linux)	2m 29s
Test (arm-linux)	2m 53s
Test (aarch64-linux)	2m 24s
Test (arm64-macos)	3m 1s
Test (x86_64-macos)	2m 33s
Test (x86_64-mingw)	6m 31s
Test (i686-msvc)	6m 13s
Test (x86_64-msvc)	5m 14s
	1h 10m 14s

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