Bug#987149: xscreensaver: allows starting external programs with cap_net_raw

[Jamie Zawinski]

As I said, it's already fixed in 6.00. The fix is just to configure without 
setcap and use setuid instead, which works properly with Mesa.

I assume that having 6.00 distributed by Debian prior to 2035 would be asking 
too much, but we dare to dream.