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 tanh = __tanh
  
  /* INDENT OFF */
  /*
   * TANH(X)
   * RETURN THE HYPERBOLIC TANGENT OF X
--- 25,35 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __tanh = tanh
  
  /* INDENT OFF */
  /*
   * TANH(X)
   * RETURN THE HYPERBOLIC TANGENT OF X
*** 54,64 ****
   *      tanh(NaN) is NaN;
   *      only tanh(0)=0 is exact for finite argument.
   */
  
  #include "libm.h"
- #include "libm_synonyms.h"
  #include "libm_protos.h"
  #include <math.h>
  
  static const double
          one = 1.0,
--- 54,63 ----