Add a test for this behaviour.

The render target should be left alone if the render target argument is
NULL. WineD3D calls should be done inside the critical section.

Turns out the original fix was correct for fixed function, but for the
wrong reason. The shader path was already correct. This fixes a
regresssion introduced by 932e95c1.

It seems that with Win2k3, the meaning of SO_REUSEADDR got closer to
BSD semantics. This is nice, as it allows us to finally work like some
version of Windows here.

Currently, stdole2.tlb isn't generated correctly and causes "<failed>"
to appear instead of "FontEvents" in the IFontEventsDisp typedef when
viewed with oleview.

The problem is that the typedef should just generate a VT_USERDEFINED
record, but ends up generating a VT_PTR -> VT_USERDEFINED. So remove
the extra writing of VT_PTR entries.

Fix the skipped pointers checks in encode_type and encode_type to
specifically detect VT_UNKNOWN and VT_DISPATCH types which don't need
one level of pointers, whereas interfaces encoded as VT_USERDEFINED
do.