5261 libm should stop using synonyms.h

*** 28,38 ****
  
          .file   "scalblnl.s"
  
  #include "libm.h"
  LIBM_ANSI_PRAGMA_WEAK(scalblnl,function)
- #include "libm_synonyms.h"
  
          ENTRY(scalblnl)
          fildl   16(%esp)                / convert 32-bit integer N
                                          / to extended-double
          fldt    4(%esp)                 / push x
--- 28,37 ----