[libgd] Fix distcheck

[Paolo Borelli <pborelli src gnome org>]

commit bda4b2cd115de3780136c17a8efd49e609914482
Author: Paolo Borelli <pborelli gnome org>
Date:   Tue Apr 30 08:05:24 2013 +0200

    Fix distcheck

 Makefile.am |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 0abb577..9751494 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -24,11 +24,16 @@ endif
 libgd_la_LIBADD = $(LIBGD_LIBS) $(LIBM)
 libgd_la_LDFLAGS = -avoid-version
 libgd_la_SOURCES = libgd/gd.h
-nodist_libgd_la_SOURCES =                      \
+nodist_libgd_la_SOURCES =
+
+catalog_sources =                              \
        libgd/gd-types-catalog.c                \
        libgd/gd-types-catalog.h                \
        $(NULL)
 
+nodist_libgd_la_SOURCES += $(catalog_sources)
+EXTRA_DIST += $(catalog_sources)
+
 if LIBGD_GTK_HACKS
 gtk_hacks_sources =                             \
         libgd/gd-entry-focus-hack.c             \