The NetBSD Standard C Library uses internally some of its functions with
a mangled symbol name, usually "_symbol". The internal functions shall not
use the global (public) symbols.
Add asctime to namespace.h.
Register a new __weak_alias() entry for asctime() in asctime.c.
acstime() is used internally in ctime and __ctime50. This revision switches
the internal usage to the internal symbol.
Sponsored by <The NetBSD Foundation>
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