Merge pull request #449 from mehlis/fix-yield

Fix yield (missing part)

boards/native/drivers/native-uart0.c

@@ -32,12 +32,15 @@
 #include <sys/select.h>
 
 #include "cpu.h"
-#include "debug.h"
 #include "board_uart0.h"
+#include "thread.h"
 
 #include "native_internal.h"
 #include "board_internal.h"
 
+#define ENABLE_DEBUG (0)
+#include "debug.h"
+
 int _native_uart_sock;
 int _native_uart_conn;