[Bug-gnubg] Minor win install improvement

[Massimiliano Maini]

1 -It seems it is possible to detect gnubg is runnig when the
InnoSetup installer is launched (check the section Application is
running):

http://www.vincenzo.net/isxkb/index.php?title=Application_considerations

Does gnubg create such a mutex ? If yes, what's the mutex name ?
If no, can we do it so that I can add the check to the installer ?

MaX.