security/gost-engine: Fix build with OpenSSL 3.0.0

• Although this ports sets up different flavor for base and openssl30 however it was not checking the SSL_DEFAULT and was always building with base even though SSL_DEFAULT was openssl30. This commit fixes this by checking the SSL_DEFAULT and changing the default FLAVOR.
• Add additional pkg-plist for openssl30 flavor
• Remove unused BROKEN_SSL_REASON_* which were not mentioned in BROKEN_SSL

Approved by: portmgr (blanket)