Legacy cleanup, part 2 (#3659)

* Legacy cleanup, part 2

There are still things that can be removed, those will be likely done in part three:
`The Return of the Cleanup` :)

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Fix windows build

Somehow there were some unfixed errors from enabled warnings?
I'm unsure if I've pulled repo in unstable state, or those were somehow
missed.

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

Code/Editor/Include/IFileUtil.h

@@ -9,6 +9,7 @@
 #pragma once
 
 #include "../Include/SandboxAPI.h"
+#include <CryCommon/LegacyAllocator.h>
 #include <set>
 
 class QWidget;
@@ -103,7 +104,7 @@ struct IFileUtil
         }
     };
 
-    typedef DynArray<FileDesc> FileArray;
+    using FileArray = AZStd::vector<FileDesc, AZ::StdLegacyAllocator>;
 
     typedef bool (* ScanDirectoryUpdateCallBack)(const QString& msg);