5261 libm should stop using synonyms.h

@@ -28,11 +28,10 @@
 
         .file "acosl.s"
 
 #include "libm.h"
 LIBM_ANSI_PRAGMA_WEAK(acosl,function)
-#include "libm_synonyms.h"
 
 #undef fabs
 
         ENTRY(acosl)
         fldt    4(%esp)                 / push x