Remove the wine-staging port which has been BROKEN (and is not fixable
as such, since the latest patchset no longer applies to current versions
of Wine).

This is logical consequence of r462267 removing the STAGING option from
emulators/wine-devel with the follow rationale:

  Remove the STAGING option which has been marked BROKEN for 11 weeks
  now that the Wine Staging tree has been declared suspended yesterday,
  cf. https://www.wine-staging.com/news/2018-02-17-future-wine-staging.html .

OPTIONS_SET/OPTIONS_UNSET are global variables, they cannot be used in ports
Makefiles.

So, replace them with OPTIONS_SLAVE, OPTIONS_EXCLUDE, OPTIONS_DEFAULT,
where appropriate.

The ghostscript ports are doing something nasty that is certainly wrong,
but I don't want to try to understand it.

Sponsored by:	Absolight

emulators/i386-wine-devel: update to 1.9.2

 - Move USE_AUTOTOOLS from wine-staging to wine-devel to ensure wine-devel's
   STAGING option works correctly.
 - Patch staging's patchinstall.sh to use the correct (suffixed) autoreconf
   binary.
 - Mark wine-staging's STAGING option a slave option.

Remove the SLAVE_PORT setting which does not have a function actually.

Move the setting of PKGNAMESUFFIX into a new block at the beginning
of this Makefile to align closer with FreeBSD Ports standards.

Rename emulators/wine-compholio to emulators/wine-staging and
accordingly emulators/i386-wine-compholio to emulators/i386-wine-staging.

Adjust CONFLICTS across all Wine related ports.

Reviewed by:	dbn, kmoore