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 cacoshl = __cacoshl
  
  #include "libm.h"       /* fabsl/isnanl/isinfl/signbitl */
  #include "complex_wrapper.h"
  #include "longdouble.h"
  
--- 25,35 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __cacoshl = cacoshl
  
  #include "libm.h"       /* fabsl/isnanl/isinfl/signbitl */
  #include "complex_wrapper.h"
  #include "longdouble.h"