Add `set_cert_verify_callback` (`SSL_CTX_set_cert_verify`) #938

Job	Run time
clippy	8m 16s
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	1m 55s
rustfmt	11s
Cross build from macOS to Linux (FIPS) (x86_64-unknown-linux-gnu)	3m 36s
Test features	7m 22s
Test (stable)	2m 12s
Test FIPS integration	2m 55s
Test (arm-android)	2m 12s
Test (arm64-android)	2m 11s
Test (i686-android)	2m 10s
Test (x86_64-android)	2m 1s
Test (aarch64-ios)	2m 20s
Test (aarch64-ios-sim)	2m 59s
Test (x86_64-ios)	2m 28s
Test (i686-linux)	2m 21s
Test (arm-linux)	2m 20s
Test (aarch64-linux)	2m 25s
Test (arm64-macos)	2m 11s
Test (x86_64-macos)	2m 24s
Test (x86_64-mingw)	7m 10s
Test (i686-msvc)	7m 18s
Test (x86_64-msvc)	5m 52s
	1h 14m 49s

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