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 atanh = __atanh
+#pragma weak __atanh = atanh
 
 /* INDENT OFF */
 /*
  * atanh(x)
  * Code originated from 4.3bsd.

@@ -49,11 +49,10 @@
  *      atanh(+-1) is +-INF with signal.
  */
 /* INDENT ON */
 
 #include "libm.h"
-#include "libm_synonyms.h"
 #include "libm_protos.h"
 #include <math.h>
 
 double
 atanh(double x) {