* random.c (N, M): undef for <winnt.h> on MinGW.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

random.c

@@ -133,6 +133,9 @@ genrand_real()
     /* divided by 2^32 */
 }
 
+#undef N
+#undef M
+
 /* These real versions are due to Isaku Wada, 2002/01/09 added */
 
 #include "ruby.h"