5261 libm should stop using synonyms.h

*** 25,38 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak fabs = __fabs
  
  #include "libm.h"
- #include "libm_synonyms.h"
  #include "libm_macros.h"
  #include <math.h>
  
  double
  fabs(double x) {
--- 25,37 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __fabs = fabs
  
  #include "libm.h"
  #include "libm_macros.h"
  #include <math.h>
  
  double
  fabs(double x) {