strptime: add support for %t and %n
Posix strptime() requires support for %t and %n, which were added
to the illumos port. Curiously we were skipping white spaces by
default in most other cases making %t meaningless.
We now skip spaces in the case of the %e specifier as strftime(3)
explicitly adds a space for the single digit case.
Reference:
http://pubs.opengroup.org/onlinepubs/009695399/functions/strptime.html
PR: 173421
Obtained from: Illumos (Rev. a11c1571b6942161b0186d0588609448066892c2)