Add read support for AArch64

buildtest.c

@@ -25,7 +25,7 @@ int main() {
   if(pid == 0) return 0;
   //TODO: wait on child to remove zombie process
 
-  #if defined(__x86_64__)
+  #if defined(__x86_64__) || defined(__aarch64__)
   // Test the read syscall
   #define INPUT_BUFFER_LEN 4096
   char input_buffer[INPUT_BUFFER_LEN] = {0};