5261 libm should stop using synonyms.h

@@ -25,12 +25,10 @@
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak sinpil = __sinpil
-
 /*
  * long double sinpil(long double x),
  * return long double precision sinl(pi*x).
  *
  * Algorithm, 10/17/2002, K.C. Ng