5261 libm should stop using synonyms.h

@@ -24,11 +24,11 @@
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak atan2 = __atan2
+#pragma weak __atan2 = atan2
 
 #include "libm.h"
 
 /*
  * Let t(0) = 1 and for i = 1, ..., 160, let t(i) be the slope of