Add SSL_CTX_dup API #47

Job	Run time
compiler (gcc-7, ubuntu-20.04)	2m 6s
compiler (gcc-8, ubuntu-20.04)	1m 45s
compiler (gcc-9, ubuntu-20.04)	1m 44s
compiler (gcc-10, ubuntu-20.04)	1m 50s
compiler (gcc-11, ubuntu-22.04)	1m 35s
compiler (gcc-12, ubuntu-22.04)	2m 11s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	2m 19s
compiler (clang-6.0, ubuntu-20.04)	1m 52s
compiler (clang-7, ubuntu-20.04)	1m 52s
compiler (clang-8, ubuntu-20.04)	1m 57s
compiler (clang-9, ubuntu-20.04)	2m 1s
compiler (clang-10, ubuntu-20.04)	1m 45s
compiler (clang-11, ubuntu-20.04)	1m 51s
compiler (clang-12, ubuntu-20.04)	1m 59s
compiler (clang-13, ubuntu-22.04)	1m 52s
compiler (clang-14, ubuntu-22.04)	1m 42s
compiler (clang-15, ubuntu-22.04, jammy)	2m 4s
compiler (clang-16, ubuntu-22.04, jammy)	1m 57s
	34m 22s

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