5261 libm should stop using synonyms.h

@@ -24,12 +24,10 @@
 /*
  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak atan2pif = __atan2pif
-
 #include "libm.h"
 
 static const double invpi = 0.3183098861837906715377675;
 
 float