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 llroundf = __llroundf
  #if defined(__sparcv9) || defined(__amd64)
! #pragma weak lroundf = __llroundf
! #pragma weak __lroundf = __llroundf
  #endif
  
  #include "libm.h"
  
  long long
--- 25,38 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __llroundf = llroundf
  #if defined(__sparcv9) || defined(__amd64)
! #pragma weak lroundf = llroundf
! #pragma weak __lroundf = llroundf
  #endif
  
  #include "libm.h"
  
  long long