CDRIVER-2630 build fails on system w/o openssl
CDRIVER-2630 build fails on system w/o openssl

Only check for OpenSSL's ASN1_STRING_get0_data if we've already checked that
OpenSSL is available.

jmikola/mongo-c-driver,mongodb/mongo-c-driver,derickr/mongo-c-driver,rcsanchez97/mongo-c-driver,ajdavis/mongo-c-driver,jmikola/mongo-c-driver,acmorrow/mongo-c-driver,acmorrow/mongo-c-driver,rcsanchez97/mongo-c-driver,rcsanchez97/mongo-c-driver,mongodb/mongo-c-driver,beingmeta/mongo-c-driver,remicollet/mongo-c-driver,remicollet/mongo-c-driver,rcsanchez97/mongo-c-driver,remicollet/mongo-c-driver,beingmeta/mongo-c-driver,remicollet/mongo-c-driver,mongodb/mongo-c-driver,derickr/mongo-c-driver,jmikola/mongo-c-driver,acmorrow/mongo-c-driver,remicollet/mongo-c-driver,mongodb/mongo-c-driver,ajdavis/mongo-c-driver,jmikola/mongo-c-driver,acmorrow/mongo-c-driver,rcsanchez97/mongo-c-driver,derickr/mongo-c-driver,beingmeta/mongo-c-driver,beingmeta/mongo-c-driver,rcsanchez97/mongo-c-driver,ajdavis/mongo-c-driver,jmikola/mongo-c-driver,mongodb/mongo-c-driver,ajdavis/mongo-c-driver,ajdavis/mongo-c-driver,mongodb/mongo-c-driver,derickr/mongo-c-driver,jmikola/mongo-c-driver,acmorrow/mongo-c-driver,beingmeta/mongo-c-driver,remicollet/mongo-c-driver,derickr/mongo-c-driver,mongodb/mongo-c-driver,jmikola/mongo-c-driver,remicollet/mongo-c-driver,rcsanchez97/mongo-c-driver,beingmeta/mongo-c-driver,beingmeta/mongo-c-driver,beingmeta/mongo-c-driver,acmorrow/mongo-c-driver,ajdavis/mongo-c-driver,derickr/mongo-c-driver,derickr/mongo-c-driver,acmorrow/mongo-c-driver,ajdavis/mongo-c-driver