[gegl] Fix distcheck failing due to non-disted file common.c

[Jon Nordby <jonnor src gnome org>]

commit eaef7d2c66c2de63862bd8aa37f5af17e9e3e274
Author: Jon Nordby <jononor gmail com>
Date:   Mon Sep 5 19:28:58 2011 +0200

    Fix distcheck failing due to non-disted file common.c

 tests/xml/Makefile.am |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/tests/xml/Makefile.am b/tests/xml/Makefile.am
index c2e8f03..76d4bde 100644
--- a/tests/xml/Makefile.am
+++ b/tests/xml/Makefile.am
@@ -12,6 +12,9 @@ noinst_PROGRAMS = \
 
 TESTS = $(noinst_PROGRAMS)
 
+# Included directly in other c files so it needs to be disted
+EXTRA_DIST = common.c
+
 # Common CPPFLAGS
 AM_CPPFLAGS = \
 	-I$(top_srcdir) \