[mutter] Fix compilation with --disable-introspection

[Owen Taylor <otaylor src gnome org>]

commit 41ae760454fa6b4aff50ff417d8a6ea265d82253
Author: Lionel Landwerlin <llandwerlin gmail com>
Date:   Fri Nov 25 18:28:38 2011 +0000

    Fix compilation with --disable-introspection
    
    Signed-off-by: Lionel Landwerlin <lionel g landwerlin linux intel com>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=661871

 src/core/mutter.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/src/core/mutter.c b/src/core/mutter.c
index 159bbf3..117a549 100644
--- a/src/core/mutter.c
+++ b/src/core/mutter.c
@@ -25,9 +25,7 @@
 
 #include <meta/main.h>
 #include <meta/util.h>
-#ifdef HAVE_INTROSPECTION
 #include "meta-plugin-manager.h"
-#endif
 
 #include <glib.h>