Fix for host target

Author: dok-net

tests/host/common/Arduino.cpp

@@ -15,6 +15,7 @@
 
 #include <sys/time.h>
 #include "Arduino.h"
+#include <Delegate.h>
 
 #include <unistd.h>
 
@@ -62,6 +63,8 @@ extern "C" void esp_delay (unsigned long ms)
     usleep(ms * 1000);
 }
 
+using IsBlockedCB = Delegate<bool(), void*>;
+
 inline void esp_yield(const IsBlockedCB& blocked) {
     (void)blocked;
 }