Add `set_cert_verify_callback` (`SSL_CTX_set_cert_verify`) #944

Job	Run time
clippy	9m 33s
Cross build from macOS to Linux (FIPS) (x86_64-unknown-linux-gnu)	2m 57s
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	2m 49s
rustfmt	15s
Test features	7m 24s
Test FIPS integration	2m 53s
Test (stable)	2m 8s
Test (arm-android)	2m 2s
Test (arm64-android)	2m 5s
Test (i686-android)	2m 1s
Test (x86_64-android)	2m 10s
Test (aarch64-ios)	2m 20s
Test (aarch64-ios-sim)	3m 33s
Test (x86_64-ios)	2m 16s
Test (i686-linux)	2m 25s
Test (arm-linux)	2m 30s
Test (aarch64-linux)	2m 20s
Test (arm64-macos)	3m 2s
Test (x86_64-macos)	2m 34s
Test (x86_64-mingw)	7m 15s
Test (i686-msvc)	5m 33s
Test (x86_64-msvc)	6m 15s
	1h 16m 20s

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