archivers/unzip-iconv

Merge 4 unzip slave ports into archivers/unzip as non-default options

It is practically impossible to use any of the unzip slave ports.  This
is because archivers/unzip is used by the ports infrastruction (via
USES=zip, USES=zip:infozip) and each slave port conflicts with it.
If you install the slave port first, then the port infrastructure can't
install archivers/unzip (although if attempted, the extracts dependency
might be satisfied by the slave port so it might actually work).

In any case, this change:
  * Adds "iconv" support as an non-default option
  * Add a localization group that can have zero or one selection
  * That group contains Chinese, Korean, or Russian support
  * WITH_UNZIP_UNREDUCE support was removed (I'm not sure it even worked)
  * Makefile was simplified (several loops removed)
  * Removes unzip-iconv, Chinese, Korean, Russian slave ports

PR:		190349
Reported by:	Mikhail Rokhin
Unzip overhaul:	marino
Approved by:	maintainer (ehaupt@)

Bring back masterdir

Reported by:	matthew
Pointyhat to:	bapt

The master being stage safe, the slave is also stage safe

Add NO_STAGE all over the place in preparation for the staging support (cat: archivers)

- Add a new port: archivers/unzip-iconv as a slave port of unzip with 		  WITH_ICONV=	yes

PR:		ports/152006
Submitted by:	KOMATSU Shinichiro <koma2_AT_lovepeers_DOT_org>