[libgd] Comment invalid <category> in DOAP file to pass git pre-receive hook

[Andre Klapper <aklapper src gnome org>]

commit c7c7ff4e05d3fe82854219091cf116cce6b19de0
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Dec 16 00:19:35 2018 +0100

    Comment invalid <category> in DOAP file to pass git pre-receive hook

 libgd.doap | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/libgd.doap b/libgd.doap
index ba0e386..6fd9c8b 100644
--- a/libgd.doap
+++ b/libgd.doap
@@ -13,7 +13,9 @@
 -->
   <bug-database rdf:resource="https://gitlab.gnome.org/GNOME/libgd/issues/"; />
 
+<!--
   <category rdf:resource="http://api.gnome.org/doap-extensions#platform"; />
+-->
 
   <maintainer>
     <foaf:Person>