wined3d: Read from stateBlock instead of updateStateBlock in wined3d_device_get_texture_stage_state().

The tiny buffer size caused audio capture glitches on OSX, where the OS
often returns audio in half-second chunks.

ntdll/tests: Use NtWriteFile instead of WriteFile in order to detect broken overlapped IO implementation.

wined3d: Read from stateBlock instead of updateStateBlock in wined3d_device_get_stream_source_freq().