emulators/i386-wine-devel: Remove port.

This port and its pre-built binaries have not been updated lately and
emulators/wine-devel is now providing i386 support on amd64, so remove
i386-wine-devel.

Adjust CONFLICTS_INSTALL on related ports and simplify (and update both
user and developer documentation in wine-devel).

Approved by:		maintainer (= submitter)
PR:			259589
Differential Revision:	https://reviews.freebsd.org/D32322

MOVED

@@ -16597,3 +16597,4 @@ astro/boinc-setiathome||2021-11-03|No longer giving out work units
 astro/boinc-astropulse||2021-11-04|boinc-setiathome removed, no longer needed
 multimedia/celluloid-devel|multimedia/celluloid|2021-11-05|Out of date: use multimedia/celluloid for now
 devel/zmusic|audio/zmusic|2021-11-10|Category change
+emulators/i386-wine-devel||2021-11-16|Removed: obsolete, emulators/wine-devel provides i386 support

emulators/Makefile

@@ -45,7 +45,6 @@
     SUBDIR += hugo
     SUBDIR += hv_kvp_cmd
     SUBDIR += i386-wine
-    SUBDIR += i386-wine-devel
     SUBDIR += ines
     SUBDIR += javatari
     SUBDIR += joytran