[niepce] Fix the desktop file generation.

[Hubert Figuière <hub src gnome org>]

commit b0c7d681bb3341d612f47466287a44c3f65881c3
Author: Hubert Figuière <hub figuiere net>
Date:   Tue Sep 16 17:58:31 2014 -0400

    Fix the desktop file generation.

 configure.ac     |    1 +
 data/Makefile.am |    5 +++++
 2 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 2ee9ecd..05bd600 100644
--- a/configure.ac
+++ b/configure.ac
@@ -187,6 +187,7 @@ src/niepce/modules/darkroom/Makefile
 src/niepce/modules/interfaces/Makefile
 src/niepce/modules/map/Makefile
 src/niepce/Makefile
+data/niepce.desktop.in
 ])
 
 fi
diff --git a/data/Makefile.am b/data/Makefile.am
index c930423..986c06d 100644
--- a/data/Makefile.am
+++ b/data/Makefile.am
@@ -1,5 +1,7 @@
 SUBDIRS = icons themes
 
+ INTLTOOL_DESKTOP_RULE@
+
 desktop_in_files = niepce.desktop.in
 desktop_files    = $(desktop_in_files:.desktop.in=.desktop)
 
@@ -24,3 +26,6 @@ CLEANFILES = \
 DISTCLEANFILES =                                \
         $(desktop_files)                        \
        $(null)
+
+check:
+       desktop-file-validate $(desktop_files)