Remove unnecessary clean command from debian/rules.
Initial upstream branch.

To convert repo layout to git-buildpackage.
http://honk.sigxcpu.org/projects/git-buildpackage/manual-html/gbp.import.html#AEN217
Imported Upstream version 1.4.17c
Merge tag 'upstream/1.4.17c'

Upstream version 1.4.17c