The fill_archive function should support being
called with a NULL fname argument. A NULL fname
argument indicates that the default archive should
be opened. We enable this by setting ah.fname to
NULL before initializing ah or calling open_archive.
This way if fname is NULL then ah.fname remains NULL
and open_archive opens the default archive.
- Allow applications to use pthread_atfork without explicitly
requiring libpthread.so. (#1013801)
- Support `--list-archive FILE' in localedef utility.
