5261 libm should stop using synonyms.h

*** 24,35 ****
  /*
   * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak scalb = __scalb
! #pragma weak _scalb = __scalb
  
  #include "libm.h"
  
  double
  scalb(double x, double fn) {
--- 24,35 ----
  /*
   * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __scalb = scalb
! #pragma weak _scalb = scalb
  
  #include "libm.h"
  
  double
  scalb(double x, double fn) {