Add Léo Cavaillé's sbuild patch for reusing existing schroot session.
Add Léo Cavaillé's sbuild patch for reusing existing schroot session.

opencollab/debile,Debian/debile,Debian/debile,tanglu-org/debile,mdimjasevic/debile,opencollab/debile,lucaskanashiro/debile,mdimjasevic/debile,tcc-unb-fga/debile,tanglu-org/debile,lucaskanashiro/debile,tcc-unb-fga/debile