Add SSL_CTX_dup API #49

Job	Run time
compiler (gcc-7, ubuntu-20.04)	6m 20s
compiler (gcc-8, ubuntu-20.04)	6m 19s
compiler (gcc-9, ubuntu-20.04)	6m 48s
compiler (gcc-10, ubuntu-20.04)	6m 26s
compiler (gcc-11, ubuntu-22.04)	6m 23s
compiler (gcc-12, ubuntu-22.04)	6m 53s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	7m 9s
compiler (clang-6.0, ubuntu-20.04)	8m 49s
compiler (clang-7, ubuntu-20.04)	6m 28s
compiler (clang-8, ubuntu-20.04)	7m 42s
compiler (clang-9, ubuntu-20.04)	7m 3s
compiler (clang-10, ubuntu-20.04)	8m 45s
compiler (clang-11, ubuntu-20.04)	8m 39s
compiler (clang-12, ubuntu-20.04)	7m 36s
compiler (clang-13, ubuntu-22.04)	6m 41s
compiler (clang-14, ubuntu-22.04)	6m 29s
compiler (clang-15, ubuntu-22.04, jammy)	8m 50s
compiler (clang-16, ubuntu-22.04, jammy)	8m 19s
	2h 11m 39s

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