AP_Common: tidy includes

libraries/AP_Common/ExpandingString.cpp

@@ -18,6 +18,8 @@
 
 #include "ExpandingString.h"
 
+#include <AP_HAL/AP_HAL.h>
+
 extern const AP_HAL::HAL& hal;
 
 #define EXPAND_INCREMENT 512

libraries/AP_Common/ExpandingString.h

@@ -18,7 +18,9 @@
 
 #pragma once
 
-#include <AP_HAL/AP_HAL.h>
+#include <AP_Common/AP_Common.h>
+
+#include <stdint.h>
 
 class ExpandingString {
 public:

libraries/AP_Common/tests/test_expandingstring.cpp

@@ -1,5 +1,6 @@
 #include <AP_gtest.h>
 #include <AP_Common/ExpandingString.h>
+#include <AP_HAL/AP_HAL.h>
 
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 

libraries/AP_Common/tests/test_expandingstring_failure.cpp

@@ -1,6 +1,7 @@
 #include <AP_gtest.h>
 #include <stdlib.h>
 #include <AP_Common/ExpandingString.h>
+#include <AP_HAL/AP_HAL.h>
 
 /**
  * This file test realloc failure on ExpandingString