5261 libm should stop using synonyms.h

*** 24,34 ****
  /*
   * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak ceil = __ceil
  
  /*
   * ceil(x) returns the least integral value bigger than or equal to x.
   * NOTE: ceil(x) returns result with the same sign as x's, including 0.
   *
--- 24,34 ----
  /*
   * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __ceil = ceil
  
  /*
   * ceil(x) returns the least integral value bigger than or equal to x.
   * NOTE: ceil(x) returns result with the same sign as x's, including 0.
   *