textproc/mgdiff: Remove libXp dependency

Remove libXp dependency from mgdiff, it is not needed, and libXp is
deprecated.
Remove deprecation from mgdiff.

textproc/mgdiff/Makefile

@@ -3,7 +3,7 @@
 
 PORTNAME=	mgdiff
 PORTVERSION=	1.0
-PORTREVISION=	4
+PORTREVISION=	5
 CATEGORIES=	textproc
 MASTER_SITES=	XCONTRIB/applications
 DISTNAME=	${PORTNAME}
@@ -11,12 +11,10 @@ DISTNAME=	${PORTNAME}
 MAINTAINER=	portmaster@BSDforge.com
 COMMENT=	Graphical front end to the UNIX diff command
 
-DEPRECATED=	Depends on deprecated libXp
-
 LICENSE=	MIT
 
 USES=		imake motif xorg
-USE_XORG=	ice sm x11 xext xmu xp xt
+USE_XORG=	ice sm x11 xext xmu xt
 
 DESKTOP_ENTRIES=	"mgdiff" "GUI front end to the UNIX diff command" \
 			"mgdiff-48x48" \

textproc/mgdiff/files/patch-Imakefile

@@ -1,18 +1,10 @@
---- ./Imakefile.orig	1994-05-19 02:01:00.000000000 +0000
-+++ ./Imakefile	2014-07-30 06:12:52.000000000 +0000
-@@ -4,11 +4,13 @@
- 
- XCOMM Imakefile,v 2.0 1994/05/19 02:01:00 dan Exp
- 
--XMLIB = -lXm
-+XMLIB = ${MOTIFLIB}
-+
+--- Imakefile.orig	2019-09-28 11:43:48 UTC
++++ Imakefile
+@@ -8,7 +8,7 @@ XMLIB = -lXm
  XCOMM
--XCOMM for Dell SVR4
-+XCOMM The gnuregex library is needed for the Motif file selection box widget.
+ XCOMM for Dell SVR4
  XCOMM
 -EXTRA_LIBRARIES = -lc -lucb
-+XCOMM 
 +EXTRA_LIBRARIES = -lgnuregex
  
  SRCS = mgdiff.c rundiff.c misc.c files.c spawn.c manual.c modal.c legend.c