Processed: sbuild: Allow the user to override the dpkg-buildpackage command

[Debian Bug Tracking System]

Processing control commands:

> block 847805 by -1
Bug #847805 [reprotest] reprotest: document/support simple reproducibility test with sbuild
847805 was not blocked by any bugs.
847805 was not blocking any bugs.
Added blocking bug(s) of 847805: 875445

-- 
847805: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=847805
875445: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=875445
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