user32::CreateWindowExA

pub unsafe extern "system" fn CreateWindowExA(dwExStyle: DWORD, lpClassName: LPCSTR, lpWindowName: LPCSTR, dwStyle: DWORD, x: c_int, y: c_int, nWidth: c_int, nHeight: c_int, hWndParent: HWND, hMenu: HMENU, hInstance: HINSTANCE, lpParam: LPVOID) -> HWND