5261 libm should stop using synonyms.h

*** 25,35 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak scalblnf = __scalblnf
  
  #include "libm.h"
  #include <float.h>              /* FLT_MAX, FLT_MIN */
  
  static const float twom25f = 2.98023223876953125e-8F;
--- 25,35 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __scalblnf = scalblnf
  
  #include "libm.h"
  #include <float.h>              /* FLT_MAX, FLT_MIN */
  
  static const float twom25f = 2.98023223876953125e-8F;