debian/control: re-add quild build dep
debian/control: re-add quild build dep

quilt is needed by lauchpad to build the package


Former-commit-id: d8595304b45e22adea6e86bf509d042514f83395 [formerly 4aaebf3cb59c6c71cf897a5c6d832b23abf12258]
Former-commit-id: d9f787518608edaec2204032596e9dda667bc805
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine