[REVIEW-3-5][REVIEW-3-5-5] IsOfficeRunning removed

[Andras Timar]

Hi,

I removed the IsOfficeRunning custom action, because it was unreliable
and did not have any advantage over built-in mechanism for detecting
files in use during installation on Windows.

Please cherry-pick it to 3-5 and 3-5-5.

http://cgit.freedesktop.org/libreoffice/core/commit/?id=1505ba77d8051dbcf1ff681c55031ea2f6a1b83b

Thanks,
Andras