attempt to make ULONGLONG_MAX work on Windows.

include/config-win.h:
  ULONGLONG_MAX definition added
include/my_global.h:
  comment about config-win.h added

include/config-win.h

@@ -85,6 +85,7 @@
 
 #define LONGLONG_MIN	((__int64) 0x8000000000000000)
 #define LONGLONG_MAX	((__int64) 0x7FFFFFFFFFFFFFFF)
+#define ULONGLONG_MAX	((unsigned __int64) 0xFFFFFFFFFFFFFFFF)
 #define LL(A)		((__int64) A)
 
 /* Type information */

include/my_global.h

@@ -606,6 +606,7 @@ extern double		my_atof(const char*);
 /*
   Some pre-ANSI-C99 systems like AIX 5.1 and Linux/GCC 2.95 define
   ULONGLONG_MAX, LONGLONG_MIN, LONGLONG_MAX; we use them if they're defined.
+  Also on Windows we define these constants by hand in config-win.h.
 */
 
 #if defined(HAVE_LONG_LONG) && !defined(LONGLONG_MIN)