[gimp] desktop: add gimp-data-extras.metainfo.xml to .gitignore

[Michael Natterer <mitch src gnome org>]

commit 347acb16d335536fd5cb482d403696842bd62c72
Author: Michael Natterer <mitch gimp org>
Date:   Fri Mar 30 15:53:19 2018 +0200

    desktop: add gimp-data-extras.metainfo.xml to .gitignore
    
    and some cosmetic cleanup in Makefile.am

 desktop/.gitignore  |    1 +
 desktop/Makefile.am |    9 +++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/desktop/.gitignore b/desktop/.gitignore
index 5402b9e..d99cb2f 100644
--- a/desktop/.gitignore
+++ b/desktop/.gitignore
@@ -4,4 +4,5 @@
 /org.gimp.GIMP.appdata.xml
 /gimp.desktop.in
 /gimp.desktop
+/gimp-data-extras.metainfo.xml
 /.thumbnails
diff --git a/desktop/Makefile.am b/desktop/Makefile.am
index d791170..2386bed 100644
--- a/desktop/Makefile.am
+++ b/desktop/Makefile.am
@@ -1,9 +1,14 @@
 ## Makefile.am for gimp/desktop
 
-desktop_in_files = gimp.desktop.in.in
+desktop_in_files = \
+       gimp.desktop.in.in
+
 desktop_files = $(desktop_in_files:.desktop.in.in=.desktop)
 
-appstream_in_files = org.gimp.GIMP.appdata.xml.in gimp-data-extras.metainfo.xml.in
+appstream_in_files = \
+       org.gimp.GIMP.appdata.xml.in    \
+       gimp-data-extras.metainfo.xml.in
+
 appstream_files = $(appstream_in_files:.xml.in=.xml)
 
 if DESKTOP_DATADIR