Revert "perl: make File::Spec treat msys as Window"

This reverts commit eeaeecbbef.

lib/perl5/5.8.8/File/Spec.pm

@@ -14,8 +14,7 @@ my %module = (MacOS   => 'Mac',
 	      NetWare => 'Win32', # Yes, File::Spec::Win32 works on NetWare.
 	      symbian => 'Win32', # Yes, File::Spec::Win32 works on symbian.
 	      dos     => 'OS2',   # Yes, File::Spec::OS2 works on DJGPP.
-	      cygwin  => 'Cygwin',
-	      msys    => 'Win32');
+	      cygwin  => 'Cygwin');
 
 
 my $module = $module{$^O} || 'Unix';