[gimp] desktop: update the appdata to take care of the id change.

[Jehan Pagès <jehanp src gnome org>]

commit 54dda25cfcebedd6f2353f95170ebe904eb6906a
Author: Jehan <jehan girinstud io>
Date:   Sat Jan 13 04:37:38 2018 +0100

    desktop: update the appdata to take care of the id change.
    
    From AppStream docs:
    «
    In previous AppStream releases, the <id/> was used to associate metainfo
    files with their .desktop files to merge in data from .desktop files
    into the AppStream generator's final output. In modern metainfo files,
    the component-ID for desktop-application components can be an arbitrary
    string (matching the naming rules applying to all AppStream metadata),
    while the <launchable/> tag is used to associate .desktop files with
    their metainfo files.
    »

 desktop/gimp.appdata.xml.in |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/desktop/gimp.appdata.xml.in b/desktop/gimp.appdata.xml.in
index 4930932..502ec1b 100644
--- a/desktop/gimp.appdata.xml.in
+++ b/desktop/gimp.appdata.xml.in
@@ -62,6 +62,15 @@
   </kudos>
   <project_group>GNOME</project_group>
   <translation type="gettext">gimp20</translation>
+
+  <launchable type="desktop-id">gimp.desktop</launchable>
+  <provides>
+    <binary>@GIMP_COMMAND@</binary>
+    <!-- Fix the ID renaming, and things like past reviews made on the
+         older ID in software installers. -->
+    <id>gimp.desktop</id>
+  <provides>
+
   <releases>
   <!--
     <release version="2.10.0" date="TODO">