Introduce X509Flags #676

Job	Run time
clippy	1m 15s
rustfmt	11s
Cross build from macOS to Linux (FIPS) (x86_64-unknown-linux-gnu)	7m 38s
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	3m 38s
Test features	6m 7s
Test (stable)	3m 3s
Test FIPS integration	2m 37s
Test (arm-android)	1m 58s
Test (arm64-android)	2m 5s
Test (i686-android)	1m 54s
Test (x86_64-android)	1m 52s
Test (aarch64-ios)	5m 37s
Test (aarch64-ios-sim)	7m 11s
Test (x86_64-ios)	5m 44s
Test (i686-linux)	2m 21s
Test (arm-linux)	2m 14s
Test (aarch64-linux)	2m 23s
Test (arm64-macos)	6m 20s
Test (x86_64-macos)	6m 26s
Test (x86_64-mingw)	6m 2s
Test (i686-msvc)	5m 45s
Test (x86_64-msvc)	5m 43s
	1h 28m 4s

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