#5776 cleaned up the way the the current working directory is
managed (less magic state).
bcl2fastq is packaged like a russian doll, rather than an archive file
that contains the source, there's a zip file that contains a tar.gz
file that contains the source. The package definition has a bit of
extra code that unpacks the inner tarball.
That extra bit of code now needs to explicitly arrange to be in the
correct directory before it does its work.
b46f1e3605