WinCE fix, .gitignore, inlining, unused var removal, PERL_NO_GET_CONTEXT
- ret became unused in "Fix pthread include error for Time::Piece", remove
  to stop compiler warning
- add a .gitignore (from Win32::API)
- our_strptime is almost nothing but copying params and used only once
  so inline it
factor out stack pushing common code in XSUBs, fix _crt_localtime bug
factor out more duplicate code, use ALIAS: