user32::CreateMDIWindowA

pub unsafe extern "system" fn CreateMDIWindowA(lpClassName: LPCSTR, lpWindowName: LPCSTR, dwStyle: DWORD, X: c_int, Y: c_int, nWidth: c_int, nHeight: c_int, hWndParent: HWND, hInstance: HINSTANCE, lParam: LPARAM) -> HWND