wined3d: Avoid loading the destination surface in stretch_rect_fbo() if it will be completely overwritten.

We can sometimes get a FALSE result from WM_QUERYENDSESSION as a side-effect
of terminating a process. We should continue the shutdown process in this
case.

usp10: Start implementing Chaining Context Substitution Format 3: Coverage-based Chaining Context Glyph Substitution.

This downgrades a FIXME that can be triggered in normal operation
through the use of, for example, SHGetIDListFromObject.

ole32/tests: Relax the reference counting tests a bit. We only care whether references are held or not.

Native riched20.dll seems to need an IRichEditOleCallback object in
order to get a buffer to store the image (using the GetNewStorage
method).