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 atanf = __atanf
+#pragma weak __atanf = atanf
 
 /* INDENT OFF */
 /*
  * float atanf(float x);
  * Table look-up algorithm