5261 libm should stop using synonyms.h

*** 25,36 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma weak sincospi = __sincospi
- 
  /* INDENT OFF */
  /*
   * void sincospi(double x, double *s, double *c)
   * *s = sin(pi*x); *c = cos(pi*x);
   *
--- 25,34 ----
*** 70,80 ****
   * high (tpi_h) and low (tpi_l) parts and call __k_sin/cos(tip_h, tip_lo)
   * instead.
   */
  
  #include "libm.h"
- #include "libm_synonyms.h"
  #include "libm_protos.h"
  #include "libm_macros.h"
  #include <math.h>
  #if defined(__SUNPRO_C)
  #include <sunmath.h>
--- 68,77 ----