New winetest skipping test for nonexistent dll's

[Jacek Caban]

Hi Paul,

Paul Vriens wrote:

> +
> +    dll = LoadLibrary(dllname);
> +    if (!dll) {

I think it would be better to call LoadLibraryEx(dllname, LOAD_LIBRARY_AS_DATA_FILE) here to avoid executing DllMain code.

Jacek