mbv: debugging the async app

mbv/apps/async/main.cc

@@ -63,9 +63,6 @@ async::task<> echo() {
 
 }  // namespace
 
-#define XUL_SR_RX_FIFO_FULL 0x02       /* receive FIFO full */
-#define XUL_SR_RX_FIFO_VALID_DATA 0x01 /* data in receive FIFO */
-
 int main() {
     SetupUart();
     UartWriteCrash("uart setup done\r\n");
@@ -99,10 +96,6 @@ int main() {
 #include "itoa.h"
 #include "lock.h"
 
-#ifndef SBRK_STATS
-#define SBRK_STATS 0
-#endif
-
 extern unsigned char _heap_begin, _heap_end;
 
 extern "C" void* _sbrk(int increment) {