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 ctanhf = __ctanhf
  
  #include "libm.h"               /* expf/expm1f/fabsf/sincosf/sinf/tanhf */
  #include "complex_wrapper.h"
  
  /* INDENT OFF */
--- 25,35 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __ctanhf = ctanhf
  
  #include "libm.h"               /* expf/expm1f/fabsf/sincosf/sinf/tanhf */
  #include "complex_wrapper.h"
  
  /* INDENT OFF */