texi2html: update po_document/Makefile.in.in for new gettext
* The autotools_do_configure updates po/Makefile.in.in, we also need
update po_document and po_messages.
Fixed:
*** error: gettext infrastructure mismatch:
using a Makefile.in.in from gettext version 0.18 but the autoconf macros are from gettext version 0.19
* Remove fix_gettext_version.patch, it wasn't a correct fix.
* Remove unneeded code from do_configure_append/prepend().
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
