windowscodecs: Add support for IMILBitmapSource interface.

[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
http://testbot.winehq.org/JobDetails.pl?Key=25624

Your paranoid android.


=== WVISTAX64 (32 bit bitmap) ===
bitmap: unhandled exception c0000005 at 77370897

=== W2K8SE (32 bit bitmap) ===
bitmap: unhandled exception c0000005 at 778A81CB

=== W7PROX64 (32 bit bitmap) ===
bitmap: unhandled exception c0000005 at 77E035F2

=== TEST64_W7SP1 (32 bit bitmap) ===
bitmap: unhandled exception c0000005 at 77593772

=== W7PROX64 (64 bit bitmap) ===
No test summary line found

=== TEST64_W7SP1 (64 bit bitmap) ===
Timeout