5261 libm should stop using synonyms.h

*** 25,42 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak gammal = __gammal
  
  /*
   * long double gammal(long double x);
   */
  
  #include "libm.h"
- #include "libm_synonyms.h"
  #include "longdouble.h"
  
  extern int signgam;
  extern int signgaml;
  
--- 25,41 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __gammal = gammal
  
  /*
   * long double gammal(long double x);
   */
  
  #include "libm.h"
  #include "longdouble.h"
  
  extern int signgam;
  extern int signgaml;