scrrun: Implement ITextStream Close

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=14331

Your paranoid android.


=== w2000pro (32 bit filesystem) ===
filesystem.c:1385: Test failed: got 0x800a005b

=== w2003std (32 bit filesystem) ===
filesystem.c:1385: Test failed: got 0x800a005b