[gnome-software] Remove the AppStream data on 'make clean'

[Richard Hughes <rhughes src gnome org>]

commit acd44cd2519c41fe0c8b56c6e9b3be8ceb82939e
Author: Richard Hughes <richard hughsie com>
Date:   Mon Sep 2 11:23:14 2013 +0100

    Remove the AppStream data on 'make clean'

 data/Makefile.am |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/data/Makefile.am b/data/Makefile.am
index d20e47a..1020ca6 100644
--- a/data/Makefile.am
+++ b/data/Makefile.am
@@ -25,6 +25,9 @@ dist_appstream_DATA = appstream.xml.gz appstream-icons.tar.gz
 EXTRA_DIST =                                           \
        $(appdata_files)
 
+CLEANFILES =                                           \
+       $(dist_appstream_DATA)
+
 MAINTAINERCLEANFILES =                                 \
        *~                                              \
        Makefile.in