[RFC] A trivial change for DESKTOP_ENTRIES

[Warren Block]

On Tue, 12 Jul 2011, Jung-uk Kim wrote:

> After I updated x11-wm/compiz, GNOME was not able to start the window
> manager.  Basically, it complained that compiz-manager was not found.
> Then, I realized compiz-manager.desktop was automagically replaced by
> compizmanager.desktop.  Now I tracked it down to this commit:
>
> Sat Nov 27 17:42:46 2010 UTC (7 months, 2 weeks ago) by pav
>
> - DESKTOP_ENTRIES: commandline is used to name installed .desktop
> file, this can lead to files containing whitespace and funny
> characters; thus strip all non-alphanumeric characters
>
> http://www.freebsd.org/cgi/cvsweb.cgi/ports/Mk/bsd.port.mk.diff?r1=1.656;r2=1.657

My fault, arising out of 
http://www.freebsd.org/cgi/query-pr.cgi?pr=147701

Additionally allowing dashes and underlines seems harmless.  Spaces and 
disallowed characters like slashes were the original concern.