x11-toolkits/wxgtk28: mark deprecated

wxgtk28 is not maintained upstream. All ports still using wxgtk28:

- Are abandonned upstream
- Can be built with wxgtk 3.2 (only games/blokish requires 3.0)
- Are broken (emulators/lisaem)

Approved by:	portmgr
Differential Revision:	https://reviews.freebsd.org/D37129

x11-toolkits/wxgtk28-contrib/Makefile

@@ -1,6 +1,9 @@
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	The wxWidgets GUI toolkit contributed libraries
 
+DEPRECATED=	Abandoned project, use wx 3.x
+EXPIRATION_DATE=	2022-12-31
+
 WXGTK_FLAVOR=	gtk2-contrib
 MASTERDIR=	${.CURDIR}/../wxgtk28
 

x11-toolkits/wxgtk28/Makefile

@@ -10,6 +10,9 @@ MAINTAINER?=	desktop@FreeBSD.org
 COMMENT?=	The wxWidgets GUI toolkit with GTK+ bindings
 WWW=		https://www.wxwidgets.org/
 
+DEPRECATED=	Abandoned project, use wx 3.x
+EXPIRATION_DATE=	2022-12-31
+
 LIB_DEPENDS+=	libpng.so:graphics/png\
 		libtiff.so:graphics/tiff\
 		libexpat.so:textproc/expat2