[gtk+] Fix distcheck

[Matthias Clasen <matthiasc src gnome org>]

commit 76a4eeabfd98f28a5c901d7c8982c4d5eb310fd1
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Aug 16 21:20:09 2014 -0400

    Fix distcheck

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f88c008..4406403 100644
--- a/configure.ac
+++ b/configure.ac
@@ -955,14 +955,14 @@ AS_IF([test "x$enable_gtk2_dependency" = xyes],
        NATIVE_GDKPIXBUF_LIBS=`$PKG_CONFIG_FOR_BUILD --libs gdk-pixbuf-2.0`
        # This is the native gtk-update-icon-cache which will be used at
        # build time, NOT the one installed on the target host.
-       GTK_UPDATE_ICON_CACHE="`cd $srcdir && pwd`/gtk/native/native-update-icon-cache$BUILD_EXEEXT"
+       GTK_UPDATE_ICON_CACHE="`cd $builddir && pwd`/gtk/native/native-update-icon-cache$BUILD_EXEEXT"
        AC_SUBST(NATIVE_GDKPIXBUF_CFLAGS)
        AC_SUBST(NATIVE_GDKPIXBUF_LIBS)
        AC_SUBST(GTK_UPDATE_ICON_CACHE)],
 
       [# In native compiling case, the gtk-update-icon-cache installed
        # is the same as the one used during build.
-       GTK_UPDATE_ICON_CACHE="`cd $srcdir && pwd`/gtk/gtk-update-icon-cache$EXEEXT"
+       GTK_UPDATE_ICON_CACHE="\$(abs_top_builddir)/gtk/gtk-update-icon-cache$EXEEXT"
        AC_SUBST(GTK_UPDATE_ICON_CACHE)]
 )