Add SSL_CTX_dup API #46

Job	Run time
run-checker (no-cmp)	1m 35s
run-checker (no-cms)	2m 21s
run-checker (no-dgram)	1m 38s
run-checker (no-dh)	1m 41s
run-checker (no-dtls)	1m 38s
run-checker (no-ec)	1m 31s
run-checker (no-ec2m)	2m 14s
run-checker (no-ecx)	2m 15s
run-checker (no-http)	1m 45s
run-checker (no-legacy)	1m 40s
run-checker (no-sock)	1m 40s
run-checker (enable-ssl-trace)	1m 52s
run-checker (no-threads)	1m 44s
run-checker (no-thread-pool)	1m 39s
run-checker (no-default-thread-pool)	1m 59s
run-checker (no-tls)	2m 20s
run-checker (no-tls1_2)	1m 38s
run-checker (no-tls1_3)	2m 2s
run-checker (enable-trace enable-fips)	1m 42s
run-checker (no-ui)	1m 53s
run-checker (no-quic)	2m 26s
	39m 13s

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