MFH: r489092

games/lincity-ng: Fix STAGEDIR misuse also cleanup and improvements
Add LICENSE block
Add better build-time flags for configure and CPPFLAGS
Add missing USES=gl, gnome
Switch to USES=localbase
Fix incorrect STAGEDIR usage, which makes it saved in the produced binary

PR: 234489
Submitted by: amdmi3
Sponsored by: The FreeBSD Foundation

Approved by: portmgr (bugfix blanket)