FindOpenSSL: Detect OpenSSL 3.0.0

The OpenSSL versioning is changing with the upcoming 3.0.0 release.
https://www.openssl.org/blog/blog/2018/11/28/version/
Since 3.0.0, the patch letters are being dropped. The new format is:
MAJOR.MINOR.PATCH

The OPENSSL_VERSION variable can now be directly derived from the new
OPENSSL_VERSION_STR macro.
https://www.openssl.org/docs/manmaster/man3/OPENSSL_VERSION_NUMBER.html
1 file changed