Add SSL_CTX_dup API #51

Job	Run time
compiler (gcc-7, ubuntu-20.04)	6m 29s
compiler (gcc-8, ubuntu-20.04)	6m 26s
compiler (gcc-9, ubuntu-20.04)	8m 52s
compiler (gcc-10, ubuntu-20.04)	7m 30s
compiler (gcc-11, ubuntu-22.04)	6m 38s
compiler (gcc-12, ubuntu-22.04)	6m 52s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	8m 34s
compiler (clang-6.0, ubuntu-20.04)	8m 14s
compiler (clang-7, ubuntu-20.04)	6m 43s
compiler (clang-8, ubuntu-20.04)	6m 34s
compiler (clang-9, ubuntu-20.04)	6m 56s
compiler (clang-10, ubuntu-20.04)	6m 33s
compiler (clang-11, ubuntu-20.04)	6m 27s
compiler (clang-12, ubuntu-20.04)	6m 40s
compiler (clang-13, ubuntu-22.04)	6m 34s
compiler (clang-14, ubuntu-22.04)	6m 44s
compiler (clang-15, ubuntu-22.04, jammy)	7m 59s
compiler (clang-16, ubuntu-22.04, jammy)	6m 56s
	2h 7m 41s

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