add patch to make libart work again with c++

(also found in upstream svn)

at least kdelibs3 is happy again

"Please commit!" martynas@

graphics/libart/Makefile

@@ -1,10 +1,10 @@
-# $OpenBSD: Makefile,v 1.17 2007/04/24 20:44:29 jasper Exp $
+# $OpenBSD: Makefile,v 1.18 2007/04/25 14:17:09 jasper Exp $
 
 COMMENT=		"high-performance 2D graphics library"
 
 VERSION=		2.3.19
 DISTNAME=		libart_lgpl-${VERSION}
-PKGNAME=		libart-${VERSION}
+PKGNAME=		libart-${VERSION}p0
 SHARED_LIBS +=	art_lgpl_2           5.19     # .5.19
 CATEGORIES=		graphics
 

graphics/libart/patches/patch-art_misc_h

@@ -0,0 +1,21 @@
+$OpenBSD: patch-art_misc_h,v 1.1 2007/04/25 14:17:09 jasper Exp $
+--- art_misc.h.orig	Wed Apr 25 11:55:05 2007
++++ art_misc.h	Wed Apr 25 11:55:35 2007
+@@ -34,9 +34,17 @@
+ #include <libart_lgpl/art_config.h>
+ #endif
+ 
++#ifdef __cplusplus
++extern "C" {
++#endif /* __cplusplus */
++
+ void *art_alloc(size_t size);
+ void art_free(void *ptr);
+ void *art_realloc(void *ptr, size_t size);
++
++#ifdef __cplusplus
++}
++#endif /* __cplusplus */
+ 
+ /* These aren't, strictly speaking, configuration macros, but they're
+    damn handy to have around, and may be worth playing with for