[pitivi] flatpak: Unset GST_SYSTEM_PLUGIN_PATH

[Thibault Saunier <tsaunier src gnome org>]

commit ceac95f100bad44e5aa73aed7b4cf525f45cb8d2
Author: Thibault Saunier <tsaunier gnome org>
Date:   Thu Jun 2 21:47:09 2016 -0400

    flatpak: Unset GST_SYSTEM_PLUGIN_PATH
    
    We should exclusively use the plugins we build, not the one form the gnome Platform

 build/flatpak/pitivi-flatpak |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/build/flatpak/pitivi-flatpak b/build/flatpak/pitivi-flatpak
index 2d4eb7a..e50debe 100755
--- a/build/flatpak/pitivi-flatpak
+++ b/build/flatpak/pitivi-flatpak
@@ -396,6 +396,7 @@ then
       --env=GST_PRESET_PATH=/app/share/gstreamer-1.0/presets/:/app/share/pitivi/gstpresets/:$GST_PRESET_PATH 
\
       --env=GST_ENCODING_TARGET_PATH=/app/share/pitivi/gstpresets/:$GST_ENCODING_TARGET_PATH \
       --env=GST_DEBUG=$GST_DEBUG \
+      --env=GST_PLUGIN_SYSTEM_PATH= \
       --env=GST_VALIDATE=$GST_VALIDATE \
       --env=GST_VALIDATE_LAUNCHER_DEBUG=$GST_VALIDATE_LAUNCHER_DEBUG \
       --env=PITIVI_DEBUG=$PITIVI_DEBUG \