Add SSL_CTX_dup API #55

Job	Run time
compiler (gcc-7, ubuntu-20.04)	1m 0s
compiler (gcc-8, ubuntu-20.04)	1m 1s
compiler (gcc-9, ubuntu-20.04)	1m 2s
compiler (gcc-10, ubuntu-20.04)	58s
compiler (gcc-11, ubuntu-22.04)	1m 4s
compiler (gcc-12, ubuntu-22.04)	1m 26s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	1m 11s
compiler (clang-6.0, ubuntu-20.04)	1m 7s
compiler (clang-7, ubuntu-20.04)	1m 10s
compiler (clang-8, ubuntu-20.04)	1m 22s
compiler (clang-9, ubuntu-20.04)	1m 28s
compiler (clang-10, ubuntu-20.04)	1m 10s
compiler (clang-11, ubuntu-20.04)	1m 15s
compiler (clang-12, ubuntu-20.04)	1m 11s
compiler (clang-13, ubuntu-22.04)	1m 18s
compiler (clang-14, ubuntu-22.04)	1m 14s
compiler (clang-15, ubuntu-22.04, jammy)	1m 18s
compiler (clang-16, ubuntu-22.04, jammy)	1m 28s
compiler (clang-17, ubuntu-22.04, jammy)	1m 24s
	23m 7s

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