* [utlMessageThread] some very small improvements

uutlMessageThread.pas

@@ -43,7 +43,7 @@ type
     //Messages Objects passed to PostMessage will be freed automatically
     procedure PostMessage(const aID: Cardinal; const aWParam, aLParam: PtrInt); overload;
     procedure PostMessage(const aID: Cardinal; const aArgs: TObject); overload;
-    procedure PostMessage(const aMsg: TutlMessage); overload;
+    procedure PostMessage(const aMsg: TutlMessage); virtual; overload;
 
     //Messages Objects passed to SendMessage must be freed by user when WaitResult is wrSignaled (otherwise the thread will handle it)
     function SendMessage(const aID: Cardinal; const aWParam, aLParam: PtrInt;
@@ -51,7 +51,7 @@ type
     function SendMessage(const aID: Cardinal; const aArgs: TObject;
       const aWaitTime: Cardinal = INFINITE): TWaitResult; overload;
     function SendMessage(const aMsg: TutlSynchronousMessage;
-      const aWaitTime: Cardinal = INFINITE): TWaitResult;
+      const aWaitTime: Cardinal = INFINITE): TWaitResult; virtual; overload;
 
     constructor Create(CreateSuspended: Boolean; const StackSize: SizeUInt=DefaultStackSize);
     destructor Destroy; override;