clutter: update configure options

Building the X11 backend fails with XQuartz (at least); patches welcome
to remedy this.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Library/Formula/clutter.rb

@@ -17,9 +17,9 @@ class Clutter < Formula
 
   def install
     system "./configure", "--prefix=#{prefix}",
-                          "--with-flavour=osx",
-                          "--with-imagebackend=quartz",
-                          "--disable-introspection"
+                          "--disable-introspection",
+                          "--enable-quartz-backend",
+                          "--disable-x11-backend"
     system "make install"
   end
 end