Add SSL_CTX_dup API #46

Job	Run time
compiler (gcc-7, ubuntu-20.04)	2m 6s
compiler (gcc-8, ubuntu-20.04)	2m 3s
compiler (gcc-9, ubuntu-20.04)	2m 12s
compiler (gcc-10, ubuntu-20.04)	1m 44s
compiler (gcc-11, ubuntu-22.04)	1m 47s
compiler (gcc-12, ubuntu-22.04)	2m 22s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	2m 48s
compiler (clang-6.0, ubuntu-20.04)	1m 51s
compiler (clang-7, ubuntu-20.04)	1m 55s
compiler (clang-8, ubuntu-20.04)	1m 54s
compiler (clang-9, ubuntu-20.04)	2m 26s
compiler (clang-10, ubuntu-20.04)	1m 48s
compiler (clang-11, ubuntu-20.04)	1m 39s
compiler (clang-12, ubuntu-20.04)	2m 22s
compiler (clang-13, ubuntu-22.04)	2m 5s
compiler (clang-14, ubuntu-22.04)	2m 48s
compiler (clang-15, ubuntu-22.04, jammy)	1m 50s
compiler (clang-16, ubuntu-22.04, jammy)	2m 5s
	37m 45s

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