5261 libm should stop using synonyms.h

@@ -28,11 +28,10 @@
  */
 
 #pragma weak nearbyintf = __nearbyintf
 
 #include "libm.h"
-#include "fenv_synonyms.h"
 #include <fenv.h>
 
 float
 __nearbyintf(float x) {
         union {