Update after gnulib changed.
* gettext-runtime/intl/configure.ac: Test also REPLACE_TWALK.
* gettext-tools/src/po-xerror.c: Don't include "getprogname.h".
* gnulib-local/lib/xerror.c: Likewise.
* gnulib-local/lib/error-progname.c: Include <stdlib.h> instead of
getprogname.h.
* gnulib-local/lib/error.in.h.diff: Renamed from gnulib-local/lib/error.h.diff.
* gnulib-local/Makefile.am (EXTRA_DIST): Update.
* gnulib-local/modules/gettext-tools-misc (Makefile.am): Update comment.
