5261 libm should stop using synonyms.h

@@ -28,11 +28,10 @@
 
         .file   "log2.s"
 
 #include "libm.h"
 LIBM_ANSI_PRAGMA_WEAK(log2,function)
-#include "libm_synonyms.h"
 
         ENTRY(log2)
         fld1                    / push 1.0
         fldl    4(%esp)         / push x
         fyl2x                   / st = 1.0*log2(arg)