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 asin = __asin
  
  /* INDENT OFF */
  /*
   * asin(x)
   * Method :
--- 25,35 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __asin = asin
  
  /* INDENT OFF */
  /*
   * asin(x)
   * Method :
*** 60,70 ****
   *      if |x|>1, return NaN with invalid signal.
   *
   */
  /* INDENT ON */
  
- #include "libm_synonyms.h"      /* __asin, __sqrt, __isnan */
  #include "libm_protos.h"        /* _SVID_libm_error */
  #include "libm_macros.h"
  #include <math.h>
  
  /* INDENT OFF */
--- 60,69 ----