The main version of exfatprogs is imported via the released
orig tarball with gbp import-orig. The huge tests-folder patch
is generated via:

$ git checkout master
$ gbp pq import
$ git fetch https://github.com/exfatprogs/exfatprogs/ 1.2.4
$ git checkout FETCH_HEAD tests/
$ git commit -m "Add tests folder from upstream"
$ gbp pq export
