Add additional EVP_SKEY helpers #518

Job	Run time
run-checker (no-cmp)	5m 32s
run-checker (no-cms)	5m 41s
run-checker (no-dgram)	5m 0s
run-checker (no-dh)	5m 24s
run-checker (no-dtls)	5m 40s
run-checker (no-ec)	5m 5s
run-checker (no-ecx)	5m 42s
run-checker (no-http)	5m 30s
run-checker (no-legacy)	5m 33s
run-checker (no-sock)	5m 11s
run-checker (enable-ssl-trace)	5m 36s
run-checker (no-stdio)	2m 34s
run-checker (no-threads)	5m 28s
run-checker (no-thread-pool)	5m 46s
run-checker (no-default-thread-pool)	5m 40s
run-checker (no-tls)	4m 57s
run-checker (no-tls1_2)	5m 28s
run-checker (no-tls1_3)	5m 22s
run-checker (enable-trace enable-fips)	6m 19s
run-checker (no-ui)	5m 42s
run-checker (no-quic)	5m 28s
	1h 52m 38s

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