[gnome-builder] build: fix building out of tree

[Christian Hergert <chergert src gnome org>]

commit ed8b5eb4eeb34f60bca81e7e644ba42e3e9edb1f
Author: Christian Hergert <christian hergert me>
Date:   Sat Dec 20 16:24:06 2014 -0800

    build: fix building out of tree

 src/gnome-builder.mk |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/gnome-builder.mk b/src/gnome-builder.mk
index 1f71421..af3f146 100644
--- a/src/gnome-builder.mk
+++ b/src/gnome-builder.mk
@@ -226,6 +226,7 @@ libgnome_builder_la_CFLAGS = \
        $(GTK_CFLAGS) \
        $(MAINTAINER_CFLAGS) \
        $(WEBKIT_CFLAGS) \
+       -I$(top_builddir)/src/util \
        -I$(top_srcdir)/src/animation \
        -I$(top_srcdir)/src/app \
        -I$(top_srcdir)/src/auto-indent \