devel/mongo-cxx-driver: update 1.1.0 -> 1.1.1 and cleanup

• Remove obsolete GH_TAGNAME and WRKSRC
• Correct DISTVERSIONPREFIX to match upstream
• Change COMMENT
• Add LICENSE_FILE
• Pet portlint

PR: 209321
Submitted by: Simun Mikecin <numisemis@yahoo.com> (maintainer)