[gtk+] Drop unused variable

[Matthias Clasen <matthiasc src gnome org>]

commit 50035b613cb12997d90d4c4143b3111bb005765a
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Aug 14 21:21:32 2014 -0400

    Drop unused variable
    
    Nothing is using gdk-pixbuf-csource anymore, so no need
    to set up the GDK_PIXBUF_CSOURCE variable.

 configure.ac |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 112c413..a24ec53 100644
--- a/configure.ac
+++ b/configure.ac
@@ -971,8 +971,6 @@ AS_IF([test "x$enable_gtk2_dependency" = xyes],
 
 AM_CONDITIONAL(USE_EXTERNAL_ICON_CACHE, [test "x$enable_gtk2_dependency" = xyes])
 
-AC_PATH_PROG(GDK_PIXBUF_CSOURCE, gdk-pixbuf-csource, no)
-
 ########################################
 # Windowing system checks
 ########################################