cvs newlib build issue

[Stan Moore]

Actually this is specifically a newlib issue. Apparently sometime back in
March Corinna added 

size_t  _EXFUN(wcsftime, (wchar_t *, size_t, const wchar_t *, const struct
tm *));

But forgot to add time.h to the header so the struct tm is a problem. It
doesn't seem to get pulled in anywhere else so a top level build is broke
right now. 

It's not a big problem, but I don't have any direct dealings with newlib and
lack a better communication channel to point this out.

Stan