Add SSL_CTX_dup API #50

Job	Run time
run-checker (no-cmp)	7m 15s
run-checker (no-cms)	7m 21s
run-checker (no-dgram)	8m 28s
run-checker (no-dh)	7m 9s
run-checker (no-dtls)	8m 19s
run-checker (no-ec)	8m 11s
run-checker (no-ec2m)	7m 2s
run-checker (no-ecx)	8m 56s
run-checker (no-http)	7m 7s
run-checker (no-legacy)	7m 24s
run-checker (no-sock)	6m 48s
run-checker (enable-ssl-trace)	7m 25s
run-checker (no-threads)	7m 11s
run-checker (no-thread-pool)	7m 19s
run-checker (no-default-thread-pool)	13m 12s
run-checker (no-tls)	7m 49s
run-checker (no-tls1_2)	7m 16s
run-checker (no-tls1_3)	7m 2s
run-checker (enable-trace enable-fips)	11m 17s
run-checker (no-ui)	7m 31s
run-checker (no-quic)	6m 51s
	2h 46m 53s

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