vim's tar support requires GNU tar to operate correctly; patch the relevant

script to use "gtar" not "tar". This is not added as a run dep to avoid
pulling in extra dependencies, especially xz which requires gcc3+ so is
not available on some arch and is more difficult to build on others.
(There's a clear error message at runtime if gtar is unavailable.)
ok dcoppa@ ckuethe@

editors/vim/Makefile

@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.120 2011/04/10 18:01:13 jasper Exp $
+# $OpenBSD: Makefile,v 1.121 2011/06/15 19:43:10 sthen Exp $
 
 COMMENT-main=	vi clone, many additional features
 COMMENT-lang=	vi clone, NLS subpackage
@@ -9,7 +9,7 @@ VERSION=	7.3.${REV}
 # keep PKGNAME for full version number
 PKGNAME=	vim-${VERSION}
 PKGNAME-main=	vim-${VERSION}
-REVISION-main=	0
+REVISION-main=	1
 PKGNAME-lang=	vim-lang-${VERSION}
 P=		${DISTNAME:C/[-\.]//g}
 CATEGORIES=	editors

editors/vim/patches/patch-runtime_autoload_tar_vim

@@ -0,0 +1,12 @@
+$OpenBSD: patch-runtime_autoload_tar_vim,v 1.1 2011/06/15 19:43:10 sthen Exp $
+--- runtime/autoload/tar.vim.orig	Wed Jun 15 13:27:21 2011
++++ runtime/autoload/tar.vim	Wed Jun 15 13:30:00 2011
+@@ -42,7 +42,7 @@ if !exists("g:tar_readoptions")
+  let g:tar_readoptions= "OPxf"
+ endif
+ if !exists("g:tar_cmd")
+- let g:tar_cmd= "tar"
++ let g:tar_cmd= "gtar"
+ endif
+ if !exists("g:tar_writeoptions")
+  let g:tar_writeoptions= "uf"