5261 libm should stop using synonyms.h

@@ -25,12 +25,10 @@
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak atan2pil = __atan2pil
-
 #include "libm.h"
 
 /*
  * atan2pil(y,x) = atan2l(y, x) / pi
  */