5261 libm should stop using synonyms.h

@@ -24,11 +24,11 @@
 /*
  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak atanhf = __atanhf
+#pragma weak __atanhf = atanhf
 
 #include "libm.h"
 
 static const float zero = 0.0f;