Add SSL_CTX_dup API #68

Job	Run time
address_ub_sanitizer	14m 27s
basic_clang	1m 38s
basic_gcc	1m 40s
buildtest	1m 34s
check_docs	1m 5s
check_update	1m 36s
check-ansi	1m 43s
enable_brotli_and_asan_ubsan	1m 29s
enable_brotli_and_zstd_dynamic	1m 41s
enable_brotli_dynamic	1m 59s
enable_non-default_options	1m 24s
enable_zstd_and_asan_ubsan	1m 50s
enable_zstd_dynamic	2m 10s
enable-tfo (ubuntu-latest)	1s
external-test-cf-quiche	2m 7s
enable-tfo (macos-latest)	1m 48s
external-test-pyca (1.51.0, 3.9)	1m 54s
external-tests	4m 37s
fips_and_ktls	1m 36s
legacy	1m 7s
memory_sanitizer	19m 1s
minimal	4m 10s
no-deprecated	1m 43s
no-legacy	1m 55s
non-caching	23m 22s
no-shared (ubuntu-latest)	1s
no-shared (macos-latest)	2m 32s
out-of-source-and-install (ubuntu-latest)	1s
threads_sanitizer	1m 42s
out-of-source-and-install (macos-latest)	2m 37s
	1h 44m 30s

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