Update after gnulib changed.
* Makefile.am (distcheck-hook): Update comparison of flexmember.h.
* gettext-runtime/intl/localcharset.c: Update from gnulib.
* gettext-runtime/intl/localename.c: Likewise.
* gettext-runtime/intl/lock.h: Likewise.
* gettext-runtime/intl/relocatable.c: Likewise.
* gettext-runtime/intl/vasnprintf.c: Likewise.
* gettext-runtime/intl/verify.h: Likewise.
* gettext-runtime/intl/xsize.h: Likewise.
* gettext-runtime/libasprintf/vasnprintf.c: Likewise.
* gettext-runtime/m4/*.m4: Likewise.
* gettext-tools/examples/po/remove-potcdate.sin: Likewise.
* gnulib-local/lib/execute.c.diff: Update.
