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 lrint = __lrint
  
  /*
   * lrint(x) rounds its argument to the nearest integer according
   * to the current rounding direction and converts the result to
   * a 32 bit signed integer.
--- 25,35 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __lrint = lrint
  
  /*
   * lrint(x) rounds its argument to the nearest integer according
   * to the current rounding direction and converts the result to
   * a 32 bit signed integer.