* When using sbuild, pass the arguments to mergechanges in the right
order so that we use the correct Description (the _source one,
not the one from sbuild which didn't get e.g. -v<version>).
* When using sbuild, pass the arguments to mergechanges in the right
order so that we use the correct Description (the _source one,
not the one from sbuild which didn't get e.g. -v<version>).