[Bug 44005] ieproxy registration breaks Internet Explorer 8

https://bugs.winehq.org/show_bug.cgi?id=44005

--- Comment #6 from Alexandre Julliard  ---
Loading all the dlls on prefix update is slow and fragile, we don't want to do
that.

The fakedll shouldn't get registered again once native is installed over it. If
for some reason IE uses a different path, winetricks should replace it
explicitly. But of course fixing builtin is the preferred solution.