5261 libm should stop using synonyms.h

@@ -28,11 +28,10 @@
 
         .file   "asinl.s"
 
 #include "libm.h"
 LIBM_ANSI_PRAGMA_WEAK(asinl,function)
-#include "libm_synonyms.h"
 
 #undef fabs
 
         ENTRY(asinl)
         fldt    8(%rsp)                 / push x