5261 libm should stop using synonyms.h

@@ -28,11 +28,10 @@
 
         .file "log10.s"
 
 #include "libm.h"
 LIBM_ANSI_PRAGMA_WEAK(log10,function)
-#include "libm_synonyms.h"
 #include "libm_protos.h"
 
         ENTRY(log10)
         fldlg2                          / log10(2)
         movl    8(%esp),%eax            / eax <-- hi_32(x)