mshtml: Added IHTMLDocument4::hasFocus implementation.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=19458

Your paranoid android.


=== wxppro (32 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff

=== w2003std (32 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff

=== wvistau64 (32 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff

=== w2008s64 (32 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff

=== w7u (32 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff

=== w7pro64 (32 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff

=== w8 (32 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff

=== w864 (32 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff

=== w1064 (32 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff

=== wvistau64 (64 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff

=== w7pro64 (64 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff

=== w864 (64 bit dom) ===
dom.c:6263: Test failed: hasFocus returned 0, expected ffffffff