[Gnash-dev] async plugin installation

[Dag Hovland]

Hi!

Following up on Nutchanon Wetchasit's comments to support issue 
https://savannah.gnu.org/support/?109027,
I tested replacing the gtk plugin installation calls in 
llibmedia/gst/GstUtil.cpp with the async variant.

Background:

When some plugin is lacking, gtk-gnash may call gtk libraries to install 
the relevant plugins.
The current behaviour is to use a blocking call, which leaves gnash 
frozen until the call returns. (I had an experience with the gtk plugin 
installer freezing.)
Using the async call is encouraged by the gtk manual:

https://developer.gnome.org/gst-plugins-libs/0.10/gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-async

The only downside, is that if you are playing a movie, you probably 
would prefer the movie to stop until your plugin is installed.

The patch is attached to the support issue.

Dag