winebrowser: Use user's preferred browser [try 2]

[Neil Skrypuch]

This patch implements the suggestions found at 
<http://www.winehq.org/site/fun_projects>, under "Improve winebrowser 
Script".

This time we try to be better citizens and don't start KDE programs if it 
doesn't look like KDE is running and likewise for Gnome.

Changelog:
* Use user's preferred browser in winebrowser

- Neil
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