emulators/i386-wine: Remove port.

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

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

PR:		259589
Differential Revision:	https://reviews.freebsd.org/D32322

MOVED

@@ -16599,3 +16599,4 @@ multimedia/celluloid-devel|multimedia/celluloid|2021-11-05|Out of date: use mult
 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/qemu52|emulators/qemu5|2021-11-16|Has expired
+emulators/i386-wine||2021-11-19|Removed: obsolete, emulators/wine provides i386 support

emulators/Makefile

@@ -44,7 +44,6 @@
     SUBDIR += higan
     SUBDIR += hugo
     SUBDIR += hv_kvp_cmd
-    SUBDIR += i386-wine
     SUBDIR += ines
     SUBDIR += javatari
     SUBDIR += joytran