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)
This category, to be described as "of interest to disabled
users" is intended to make it simpler for users to find
software which will let them overcome a handicap. For
example, blind users may want to combine OCR and text-to-speech
software so the computer can read books to them; users with
diminished eyesight can use large fonts and "magnifiers";
paralyzed users may use speech recognition to compose text
or give commands.
PR: ports/39103
Submitted by: Trevor Johnson <trevor@jpj.net>
