by properly coalescing all the types into the Accept header value,
rather than just adding the first.

ole32: Fix the OLE clipboard test to call OleInitialize before performing the tests to fix test failures on Windows.

ole32: Add a field to the TLS data to determine whether OLE has been initialised for the current thread.

ole32: IPeristStream implies IPersist and IStream implies ISequentialStream so fix the Structured Storage stream implementation's QueryInterface with to reflect this.

ole32: IStream inherits from ISequentialStream so the HGLOBALStream implementation must also support ISequentialStream.