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 llround = __llround
  #if defined(__sparcv9) || defined(__amd64)
! #pragma weak lround = __llround
! #pragma weak __lround = __llround
  #endif
  
  /*
   * llround(x) rounds its argument to the nearest integer, rounding
   * ties away from zero, and converts the result to a 64 bit signed
--- 25,38 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __llround = llround
  #if defined(__sparcv9) || defined(__amd64)
! #pragma weak lround = llround
! #pragma weak __lround = llround
  #endif
  
  /*
   * llround(x) rounds its argument to the nearest integer, rounding
   * ties away from zero, and converts the result to a 64 bit signed