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 hypotl = __hypotl
  
  /*
   * long double hypotl(long double x, long double y);
   * Method :
   *      If z=x*x+y*y has error less than sqrt(2)/2 ulp than sqrt(z) has
--- 25,35 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __hypotl = hypotl
  
  /*
   * long double hypotl(long double x, long double y);
   * Method :
   *      If z=x*x+y*y has error less than sqrt(2)/2 ulp than sqrt(z) has