5261 libm should stop using synonyms.h

*** 25,36 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma weak finitel = __finitel
- 
  #include "libm.h"
  
  #if defined(__sparc)
  int
  finitel(long double x) {
--- 25,34 ----