removes unused file

hello-world/wrap_stubs.c

@@ -1,15 +0,0 @@
-#include "platform.h"
-
-/* The functions in this file are only meant to support Dhrystone on an
- * embedded RV32 system and are obviously incorrect in general. */
-
-long time(void)
-{
-  return get_timer_t1_value(timer) / get_timer_freq();
-}
-
-// set the number of dhrystone iterations
-void __wrap_scanf(const char* fmt, int* n)
-{
-  *n = 100000000;
-}