emulators/pcem: Deprecate and set expiration date to 2023-11-30

Marked broken for over a year
New location of upstream repo is https://github.com/sarah-walker-pcem/pcem/

Approved by:	portmgr (blanket)

emulators/pcem/Makefile

@@ -14,6 +14,8 @@ LICENSE_FILE=	${WRKSRC}/COPYING
 
 BROKEN_FreeBSD_13=	ld: error: duplicate symbol: CGACONST
 BROKEN_FreeBSD_14=	ld: error: duplicate symbol: CGACONST
+DEPRECATED=	Fails to build and marked broken over a year ago
+EXPIRATION_DATE=2023-11-30
 
 USES=		autoreconf compiler gl gmake localbase:ldflags openal pkgconfig sdl zip
 USE_GL=		gl