[cheese] Validate AppData XML during distcheck

[David King <davidk src gnome org>]

commit f321242876a7251ddb3352e90b61ca72b3423e9a
Author: David King <amigadave amigadave com>
Date:   Tue Dec 17 07:58:42 2013 +0000

    Validate AppData XML during distcheck
    
    Force validation of AppData XML during distcheck, if a recent enough
    version of appdata-tools is available.

 Makefile.am |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index bc29b0b..c2e7c83 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -539,7 +539,11 @@ MAINTAINERCLEANFILES = \
        omf.make \
        xmldocs.make
 
-DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc --enable-introspection --enable-man
+DISTCHECK_CONFIGURE_FLAGS = \
+       --enable-appdata-check \
+       --enable-gtk-doc \
+       --enable-introspection \
+       --enable-man
 
 CHANGELOG_START = 2.26.0