Fix Time-Piece tests on Win32 with PERL_IMPLICIT_SYS

Fix Time-Piece tests on Win32 with PERL_IMPLICIT_SYS

Various fixes and improvements to 6e0733998eff7a098d2d21d5602f3eb2a7521e1f
suggested by the following emails in a long thread...

From: "Jan Dubois" <jand@activestate.com>
Date: Fri, 17 Apr 2009 10:07:19 -0700
Message-ID: <00be01c9bf7e$f8250510$e86f0f30$@com>

From: "Jan Dubois" <jand@activestate.com>
Date: Mon, 20 Apr 2009 17:58:38 -0700
Message-ID: <000f01c9c21c$4e3b6d00$eab24700$@com>

From: "Jan Dubois" <jand@activestate.com>
Date: Mon, 27 Apr 2009 18:12:15 -0700
Message-ID: <000001c9c79e$5e766f30$1b634d90$@com>

From: Rob May <rob@themayfamily.me.uk>
Date: Tue, 28 Apr 2009 19:17:44 +0100
Message-ID: <54bdc7510904281117j2058484fnb19d75d13b553c0e@mail.gmail.com>

From: Rob May <rob@themayfamily.me.uk>
Date: Sat, 2 May 2009 08:41:26 +0100
Message-ID: <54bdc7510905020041w4333e213u4630fad7c18ac919@mail.gmail.com>

From: "Jan Dubois" <jand@activestate.com>
Date: Mon, 4 May 2009 15:05:56 -0700
Message-ID: <001101c9cd04$7fefe040$7fcfa0c0$@com>