[design] Make it possible to use explicitly fetched signature impleme… #1244

Job	Run time
run-checker (enable-asan enable-ubsan no-shared no-asm -DOPENSSL_SMALL_FOOTPRINT)	15m 55s
run-checker (no-ct)	9m 44s
run-checker (no-dso)	8m 50s
run-checker (no-dynamic-engine)	11m 10s
run-checker (no-engine no-shared)	8m 12s
run-checker (no-err)	11m 2s
run-checker (no-filenames)	8m 54s
run-checker (enable-ubsan no-asm -DOPENSSL_SMALL_FOOTPRINT -fno-sanitize=alignment)	12m 52s
run-checker (no-module)	10m 51s
run-checker (no-ocsp)	8m 40s
run-checker (no-pinshared)	11m 1s
run-checker (no-srp)	9m 57s
run-checker (no-srtp)	8m 49s
run-checker (no-ts)	8m 37s
run-checker (enable-weak-ssl-ciphers)	8m 55s
run-checker (enable-zlib)	9m 55s
	2h 43m 24s

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