urlmon: Fix the MIME type reported by the HTTP protocol when the Content-Type headers contains charset data too.

[Misha Koshelev]

> Sorry to send this out after the patch has already been committed, but
> this patch is wrong. If you just output the Content-Type in
> test/protocol.c you'll see that the charset data is included in the
> "MIME type" in both Windows XP and on wine with native urlmon (from
> WinME or 98; I believe the XP one crashes wine or at least it used to).
> That is why when I was fixing the original test I just changed it to a
> memcmp from a strcmp.
> Misha

Just checked on Win98, the behavior to keep the charset in the "MIME type" is correct
on Win98 as well.

Misha