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 ctanhl = __ctanhl
  
  #include "libm.h"       /* expl/expm1l/fabsl/isinfl/isnanl/sincosl/sinl/tanhl */
  #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 __ctanhl = ctanhl
  
  #include "libm.h"       /* expl/expm1l/fabsl/isinfl/isnanl/sincosl/sinl/tanhl */
  #include "complex_wrapper.h"
  #include "longdouble.h"