Update after gnulib changed.
This fixes a compilation error e.g. on FreeBSD and AIX.
* autogen.sh (GNULIB_MODULES_TOOLS_FOR_SRC, GNULIB_MODULES_LIBGETTEXTPO): Add
'free-posix'.
* gnulib-local/lib/libxml/parser.in.h: Include <stdlib.h>.
* gettext-tools/src/format.h: Likewise.
* gettext-tools/tests/gettextpo-1-prg.c: Undefine free.
