gettext: move remove-potcdate.sin from gettext-native to gettext-minimal-native

gettext: move remove-potcdate.sin from gettext-native to gettext-minimal-native

* now autotools.bbclass are copying not only Makefile.in.in but also
  remove-potcdate.sin which is used by Makefile.in.in, so we need to
  provide this file already in gettext-minimal-native otherwise build
  can fail, when autotools.bbclass is used before gettext-native (full)
  is built.

(From OE-Core rev: e60612a9fed96d92c5119ab3b26a355d152db1b8)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>