Per Marco, don't define a "min" function if one is already defined to avoid conflict with cygwin reserved word

This commit was SVN r30241.

ompi/mca/coll/sm/coll_sm_reduce.c

@@ -52,10 +52,12 @@ static int reduce_no_order(void *sbuf, void* rbuf, int count,
 /*
  * Useful utility routine
  */
+#if !defined(min)
 static inline int min(int a, int b)
 {
     return (a < b) ? a : b;
 }
+#endif
 
 /**
  * Shared memory reduction.