user32.dll: Implementation for LockWorkStation() based on xdg-screensaver

[Paul Chitescu]

Changelog:
        user32.dll: Implementation for LockWorkStation() based on 
xdg-screensaver

Thanks to Steven Edwards (winehacker at gmail.com) for the idea of 
using "xdg-screensaver lock".

The -impl patch applies to unpatched wine.
The -stub2impl applies to wine if the LockWorkStation stub patch is already 
applied.

Known problems:
1. Although trying to check with access() if /usr/bin/xdg-screensaver is 
executable there is no error returned from spawnvp() if exec() eventually 
fails after fork() succeeds. Unlikely but possible.
2. No way to disable it - maybe users don't want their screen locked.
3. Doesn't take into account virtual desktops, and I have no idea what it 
should do in that case, just deny access?
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