iconv sync 2/x: FreeBSD SVN 263986

iconv sync 2/x: FreeBSD SVN 263986

- In the libiconv module for ISO 2022, restore the original order of the
  fields of a private struct such that variables of this type are
  initialized correctly.  This fixes conversion from ISO 2022
- In the libiconv module for EUC-TW, replace 2^cs with 1<<cs.  This fixes
  conversion from EUC-TW
- Synchronize iconv code from NetBSD.  In most cases this only updates the
  RCS id because the changes are already there or are NetBSD specific.
  * citris_csmapper.c   : Add a comment
  * citrus_db_factory.c : Remove put16()
  * citrus_iconv.c      : Return EINVAL on error
  * citrus_mapper.c     : Return EINVAL on error
  * citrus_stdenc.c     : Return EINVAL on error
  * citrus_memstream.c  : Fix type of variable
  * citrus_prop.h       : Sync definition of _CITRUS_PROP_HINT_END
  * citrus_mapper_std.c : Plug memory leak

Obtained from: NetBSD