5261 libm should stop using synonyms.h

@@ -24,12 +24,12 @@
 /*
  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak scalb = __scalb
-#pragma weak _scalb = __scalb
+#pragma weak __scalb = scalb
+#pragma weak _scalb = scalb
 
 #include "libm.h"
 
 double
 scalb(double x, double fn) {