modular xorg.
- supply corresponding USE_XORG for all imake-using ports that need it
- USE_IMAKE no longer implies USE_XLIB in absence of USE_XORG
- retire USE_X_PREFIX which is not really used anywhere after the
above change
- a few minor nits like whitespace and SF macro
Tested by: 2 tinderbox runs by pav
Approved by: portmgr (pav)
To use it, you must specify the display name of the machine you want
to watch, then the name of the window on that machine.
Xwatchwin will attempt to connect with the X server
hostname:0.0, and if successful, will try to retrieve a copy of
the window in which you specified interest.
Obtained from: NetBSD
