patch for win32.c on cygwin

[Robby Dermody]

Compiling under cygwin (at least with my setup) uses platform/win32.c
instead of platform/unix.c.

While everything seems to work correctly with this file, the one thing that
isn't right (at least for running command-line applications using physfs
within a cygwin shell, which is what I'm doing) is that the dir seperator in
Cygwin is a UNIX-like one (/) instead of the win32 one (\).

This patch changes that. Been tested and it works (not that too much could
go wrong with a 4 line patch :)

Let me know if you need any more info,

Robby
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