5261 libm should stop using synonyms.h

*** 28,38 ****
  
          .file   "scalbnl.s"
  
  #include "libm.h"
  LIBM_ANSI_PRAGMA_WEAK(scalbnl,function)
- #include "libm_synonyms.h"
  
          ENTRY(scalbnl)
          subq    $16,%rsp
          movl    %edi,(%rsp)
          fildl   (%rsp)
--- 28,37 ----