[gupnp-dlna] Relax depth requirement for PNG

[Jens Georg <jensgeorg src gnome org>]

commit e444c71a97837e61cdeaa495ca06dd0a0b96f15a
Author: Jens Georg <mail jensge org>
Date:   Fri Nov 30 16:09:32 2012 +0100

    Relax depth requirement for PNG
    
    GStreamer 1.0 currently doesn't provide this information.

 data/png.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/png.xml b/data/png.xml
index c4c98b5..501ab3e 100644
--- a/data/png.xml
+++ b/data/png.xml
@@ -65,7 +65,7 @@
       <field name="width" type="int">
         <range min="1" max="4096" />
       </field>
-      <field name="depth" type="int">
+      <field name="depth" type="int" used="in-strict">
         <value>1</value>
         <value>2</value>
         <value>4</value>