WIN32: map open to _open. Same for lseek, read, write

win32/win32_compat.h

@@ -105,6 +105,10 @@ struct pollfd {
 /* Wrapper macros to call misc. functions win32 is missing */
 #define poll(x, y, z)        win32_poll(x, y, z)
 #define inet_pton(x,y,z)     win32_inet_pton(x,y,z)
+#define open(x, y, z)        _open(x, y, z)
+#define lseek(x, y, z)       _lseek(x, y, z)
+#define read(x, y, z)        _read(x, y, z)
+#define write(x, y, z)       _write(x, y, z)
 int     getpid(void);
 int     win32_inet_pton(int af, const char * src, void * dst);
 int     win32_poll(struct pollfd *fds, unsigned int nfsd, int timeout);