Another warning fix for Mingw32

[Steven Edwards]

Same as last, if someone wants to help write a conf check by all means.

Changelog: If the platform isnt MingW32 then define MAX_PATH

cvs diff -u windef.h 
Index: windef.h
===================================================================
RCS file: /home/wine/wine/include/windef.h,v
retrieving revision 1.62
diff -u -r1.62 windef.h
--- windef.h	10 Mar 2002 00:02:34 -0000	1.62
+++ windef.h	25 Apr 2002 02:00:24 -0000
@@ -157,8 +157,9 @@
 #define _MAX_EXT            _MAX_FNAME
 #define _MAX_PATH           260
 #endif
+#if ! defined (_MINGW_)
 #define MAX_PATH            _MAX_PATH
-
+#endif

#define HFILE_ERROR     ((HFILE)-1)