add GNU patch

ok ajacoutot@ sthen@

devel/gpatch/Makefile

@@ -0,0 +1,38 @@
+# $OpenBSD: Makefile,v 1.1.1.1 2012/09/23 12:23:35 rpe Exp $
+
+COMMENT=		GNU patch
+
+VERSION=		2.7
+DISTNAME=		patch-${VERSION}
+PKGNAME=		gpatch-${VERSION}
+CATEGORIES=		devel
+
+HOMEPAGE=		http://www.gnu.org/software/patch/
+
+# GPLv3+
+PERMIT_PACKAGE_CDROM=	Yes
+PERMIT_PACKAGE_FTP=	Yes
+PERMIT_DISTFILES_CDROM=	Yes
+PERMIT_DISTFILES_FTP=	Yes
+
+WANTLIB=		c
+
+MASTER_SITES=		${MASTER_SITE_GNU:=patch/}
+
+USE_GMAKE=		Yes
+USE_GROFF=		Yes
+
+CONFIGURE_STYLE=	gnu
+CONFIGURE_ARGS+=	--program-prefix=g
+
+REGRESS_DEPENDS=	shells/bash \
+			textproc/gdiff
+REGRESS_FLAGS=		SHELL=${LOCALBASE}/bin/bash
+
+pre-regress:
+	@ln -fs ${LOCALBASE}/bin/gdiff ${WRKDIR}/bin/diff
+
+post-install:
+	@rm ${PREFIX}/lib/charset.alias
+
+.include <bsd.port.mk>

devel/gpatch/distinfo

@@ -0,0 +1,2 @@
+SHA256 (patch-2.7.tar.gz) = WcKfVvqgqSSCfmpgxqzNbikA6uXGqqkiJoxxfwamIEg=
+SIZE (patch-2.7.tar.gz) = 1013029

devel/gpatch/pkg/DESCR

@@ -0,0 +1,9 @@
+GNU patch is the Free Software Foundation's version of the patch(1)
+command.
+
+Patch takes a patch file containing a difference listing produced
+by the diff program and applies those differences to one or more
+original files, producing patched versions.
+
+The patch binary is prefixed with the letter g to differentiate it
+from the standard application with the same name.

devel/gpatch/pkg/PLIST

@@ -0,0 +1,3 @@
+@comment $OpenBSD: PLIST,v 1.1.1.1 2012/09/23 12:23:35 rpe Exp $
+@bin bin/gpatch
+@man man/man1/gpatch.1