5261 libm should stop using synonyms.h

*** 28,38 ****
  
          .file "expm1.s"
  
  #include "libm.h"
  LIBM_ANSI_PRAGMA_WEAK(expm1,function)
- #include "libm_synonyms.h"
  
          .data
          .align  4
  .mhundred:      .float  -100.0
  
--- 28,37 ----