Bug#413634: package description amendment

[petes-bugs]

Package: xvnc4viewer
Version: 4.1.1+X4.3.0-20

The package description says 'There are vncserver available for X and for
Win95/NT.'
'Win95/NT' are long superceded versions of Windows. Mentioning them makes
this package description look naive. I think it would be better to use
'Windows' or 'Microsoft Windows'.