quartz: Don't cache IFilterMapper2 interface in FilterGraph2.

[Thomas Faber]

Final patch of the series was deferred.

On 2015-11-20 15:57, Thomas Faber wrote:
> As shown by MPC-HC and tests, the constructor must not take a reference
> to outer_unk. Instead, acquire the IFilterMapper2 interface as needed
> later.


On 2015-11-20 15:51, Thomas Faber wrote:
> MPC-HC v1.7.10's CFGManager class creates a filter graph object during
> its constructor, which means it passes in an outer object with a zero
> reference count. Wine does an AddRef/Release on this object when
> constructing the filter graph, thus its reference count drops back
> to 0 and the CFGManager object gets freed prematurely.
>
> The rest of this series adds tests showing that the outer object does
> not get referenced (even temporarily) during construction, and then
> fixes Wine's implementation to comply with that requirement.

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