ctrlc_stub: Send Ctrl-Break instead of Ctrl-C

This forces also processes initiated using 'start' to terminate

Task-number: QTCREATORBUG-7455
Change-Id: I2ac7b31ebe67510dd17a2991efc30212987e967d
Reviewed-by: Joerg Bornemann <joerg.bornemann@nokia.com>

src/libs/utils/process_ctrlc_stub.cpp

@@ -120,7 +120,7 @@ int main(int argc, char **)
 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 {
     if (message == uiShutDownWindowMessage) {
-        GenerateConsoleCtrlEvent(CTRL_C_EVENT, 0);
+        GenerateConsoleCtrlEvent(CTRL_BREAK_EVENT, 0);
         PostQuitMessage(0);
         return 0;
     }