fix after libgsf update, just trust pkg-config and don't play games

with the output wrt include dirs

converters/wv2/patches/patch-cmake_FindLIBGSF_cmake

@@ -0,0 +1,19 @@
+$OpenBSD: patch-cmake_FindLIBGSF_cmake,v 1.1 2013/03/10 09:42:32 espie Exp $
+--- cmake/FindLIBGSF.cmake.orig	Sun Mar 10 10:21:37 2013
++++ cmake/FindLIBGSF.cmake	Sun Mar 10 10:41:53 2013
+@@ -28,14 +28,8 @@ IF (NOT WIN32)
+    FIND_PACKAGE(PkgConfig)
+    PKG_CHECK_MODULES(PC_LIBGSF libgsf-1)
+    SET(LIBGSF_DEFINITIONS ${PC_LIBGSF_CFLAGS_OTHER})
++   SET(LIBGSF_INCLUDE_DIR ${PC_LIBGSF_INCLUDE_DIRS})
+ ENDIF (NOT WIN32)
+-
+-FIND_PATH(LIBGSF_INCLUDE_DIR gsf/gsf.h
+-   HINTS
+-   ${PC_LIBGSF_INCLUDEDIR}
+-   ${PC_LIBGSF_INCLUDE_DIRS}
+-   PATH_SUFFIXES libgsf-1
+-   )
+ 
+ FIND_LIBRARY(LIBGSF_LIBRARIES NAMES gsf-1 libgsf-1
+    HINTS