Removed #include <unistd.h>, since it isn't needed in this file, and

doesn't exist as far as Visual C is concerned.

physfs.c

@@ -14,7 +14,6 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <fcntl.h>
-#include <unistd.h>
 #include <errno.h>
 #include <assert.h>
 #include "physfs.h"