API: add function to get all extensions present, not just recognized … #1

Job	Run time
run-checker (enable-asan enable-ubsan no-shared no-asm -DOPENSSL_SMALL_FOOTPRINT)	1m 48s
run-checker (no-ct)	1m 11s
run-checker (no-dso)	1m 12s
run-checker (no-dynamic-engine)	1m 11s
run-checker (no-ec2m)	1m 12s
run-checker (no-engine no-shared)	1m 8s
run-checker (no-err)	1m 19s
run-checker (no-filenames)	1m 11s
run-checker (enable-ubsan no-asm -DOPENSSL_SMALL_FOOTPRINT -fno-sanitize=alignment)	1m 21s
run-checker (no-module)	1m 11s
run-checker (no-ocsp)	1m 9s
run-checker (no-pinshared)	1m 14s
run-checker (no-srp)	1m 12s
run-checker (no-srtp)	1m 10s
run-checker (no-ts)	1m 9s
run-checker (enable-weak-ssl-ciphers)	1m 12s
run-checker (enable-zlib)	1m 22s
	21m 12s

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