Add SSL_CTX_dup API #51

Job	Run time
run-checker (no-cmp)	9m 43s
run-checker (no-cms)	7m 16s
run-checker (no-dgram)	7m 0s
run-checker (no-dh)	9m 47s
run-checker (no-dtls)	7m 22s
run-checker (no-ec)	7m 27s
run-checker (no-ec2m)	6m 55s
run-checker (no-ecx)	7m 17s
run-checker (no-http)	7m 21s
run-checker (no-legacy)	7m 20s
run-checker (no-sock)	6m 35s
run-checker (enable-ssl-trace)	7m 26s
run-checker (no-threads)	7m 28s
run-checker (no-thread-pool)	8m 51s
run-checker (no-default-thread-pool)	7m 36s
run-checker (no-tls)	8m 6s
run-checker (no-tls1_2)	7m 6s
run-checker (no-tls1_3)	6m 53s
run-checker (enable-trace enable-fips)	8m 13s
run-checker (no-ui)	7m 27s
run-checker (no-quic)	6m 56s
	2h 40m 5s

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