5261 libm should stop using synonyms.h

*** 25,38 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma weak atan2pil = __atan2pil
- 
  #include "libm.h"
- #include "libm_synonyms.h"
  
  #define GENERIC long double
  #define ATAN2PI atan2pil
  #define ATAN2   atan2l
  
--- 25,35 ----