5261 libm should stop using synonyms.h

@@ -25,11 +25,11 @@
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak rintl = __rintl
+#pragma weak __rintl = rintl
 
 /*
  * rintl(long double x) return x rounded to integral according to
  * the prevailing rounding direction
  *