(min, max) [_WIN32, __GNUC__]: Add min and max macros for

mingw/gcc compile environment.  min/max are not included
in stdlib.h in mingw/gcc environment.

include/misc.h

@@ -48,9 +48,11 @@ typedef long ssize_t;
 /* integral mismatch, due to misuse of sector short */
 #ifndef __GNUC__
 #pragma warning (disable : 4761 )
+#else
+#define max(a,b) ((a)>(b)?(a):(b))
+#define min(a,b) ((a)<(b)?(a):(b))
 #endif
 
-#include <windef.h>
 #include <io.h>
 
 #define random rand