5261 libm should stop using synonyms.h

*** 33,44 ****
   *
   * NOTE: aintl(x), anintl(x), ceill(x), floorl(x), and rintl(x) return result
   * with the same sign as x's,  including 0.0.
   */
  
! #pragma weak ceill = __ceill
! #pragma weak floorl = __floorl
  
  #include "libm.h"
  #include "longdouble.h"
  
  static const long double qone = 1.0L;
--- 33,44 ----
   *
   * NOTE: aintl(x), anintl(x), ceill(x), floorl(x), and rintl(x) return result
   * with the same sign as x's,  including 0.0.
   */
  
! #pragma weak __ceill = ceill
! #pragma weak __floorl = floorl
  
  #include "libm.h"
  #include "longdouble.h"
  
  static const long double qone = 1.0L;