The WM_CLASS we set on all windows is just "vncviewer", so that it
matches the name of the .desktop file, which is what GNOME expects.

This makes our builds directly compatible with most distributions
without packagers/users having to specify extra flags.

This often gives the user more information about what kind of
application this is.

These files are not Red Hat or Ubuntu specific, so install them
on all Unix systems where the viewer is installed.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@5139 3789f03b-4d11-0410-bbf8-ca57d06f2519