5261 libm should stop using synonyms.h

@@ -28,11 +28,10 @@
 
         .file "expm1.s"
 
 #include "libm.h"
 LIBM_ANSI_PRAGMA_WEAK(expm1,function)
-#include "libm_synonyms.h"
 
         .data
         .align  4
 .mhundred:      .float  -100.0