make avalonia-native compile again with import instead of include.

native/Avalonia.Native/src/OSX/SystemDialogs.mm

@@ -1,5 +1,6 @@
 #include "common.h"
 #include "window.h"
+#include "INSWindowHolder.h"
 
 class SystemDialogs : public ComSingleObject<IAvnSystemDialogs, &IID_IAvnSystemDialogs>
 {

native/Avalonia.Native/src/OSX/automation.h

@@ -1,5 +1,5 @@
 #import <Cocoa/Cocoa.h>
-#include "window.h"
+#import "window.h"
 
 NS_ASSUME_NONNULL_BEGIN
 

native/Avalonia.Native/src/OSX/automation.mm

@@ -1,7 +1,7 @@
 #include "common.h"
-#include "automation.h"
+#import "automation.h"
 #include "AvnString.h"
-#include "window.h"
+#import "INSWindowHolder.h"
 
 @interface AvnAccessibilityElement (Events)
 - (void) raiseChildrenChanged;

native/Avalonia.Native/src/OSX/menu.mm

@@ -1,7 +1,7 @@
 
 #include "common.h"
 #include "menu.h"
-#include "window.h"
+#import "window.h"
 #include "KeyTransform.h"
 #include <CoreFoundation/CoreFoundation.h>
 #include <Carbon/Carbon.h> /* For kVK_ constants, and TIS functions. */