games/gzdoom: Update to 3.7.2

Please visit https://github.com/coelckers/gzdoom/releases for highlights
from each of the intermediate releases; many bug fixes and improvements are
included, to ZScript and otherwise.

The USES change has been included only to appease portlint and formatting.

PR: 229212
Submitted by: Piotr Kubaj (pkubaj at anongoth.pl)
Approved by: zeising (ports)