[win32] Fix Parrot_asctime_r for Windows.
[win32] Fix Parrot_asctime_r for Windows.

Windows has asctime, but renders single digit days with a leading zero,
instead of blank.  This new implementation uses sprintf with the format
string specified in the C standard.  Probably not the fastest way, but
hopefully correct.


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@27857 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot