[PATCH] fix build with --disable-gconf

src/core/prefs.c still contain a call to gconf_client_set_bool() when
built with --disable-gconf, breaking the build.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
---
 src/core/prefs.c |    2 ++
 1 file changed, 2 insertions(+)

Index: metacity-2.25.1/src/core/prefs.c
===================================================================
--- metacity-2.25.1.orig/src/core/prefs.c
+++ metacity-2.25.1/src/core/prefs.c
@@ -2949,6 +2949,7 @@
 void
 meta_prefs_set_compositing_manager (gboolean whether)
 {
+#if HAVE_GCONF
   GError *err = NULL;
 
   gconf_client_set_bool (default_client,
@@ -2962,6 +2963,7 @@
                     err->message);
       g_error_free (err);
     }
+#endif
 }
 
 #ifndef HAVE_GCONF