[PATCH] mf: Handle MESourceSeeked and MEStreamSeeked state change events.

[Marvin]

Hi,

While running your changed tests, 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=107726

Your paranoid android.


=== w7u_el (32 bit report) ===

mfplat:
085c:mfplat: unhandled exception c0000005 at 6EDD7D1C