Security update for pitivi

This update for pitivi fixes the following issues:

* CVE-2015-0855: 'Insecure use of os.system()' (boo#960339)

Fixed bugs
bnc#960339
VUL-1: CVE-2015-0855: pitivi: CVE-2015-0855: Insecure use of os.system()
Selected Binaries
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