don't put multiple downloads in the same files, except
when they are dependencies that go inside the directory
of another download.
by doing this, the following functionality will become
possible: clean every project or build every project,
or maybe fetch every project, based entirely on the
names of these files.
this will be used later to simplify the release script.
Signed-off-by: Leah Rowe <leah@libreboot.org>
Leah Rowe