package: prepare for per-version hash files

package: prepare for per-version hash files

The Qt5 packages may have different licensing terms between the two
versions we support, and in some cases, those different terms are
expressed in similarly named files, like files named plain 'LICENSE' for
example.

Similarly, glibc also has different license files, especially since the
arc version still has libidn, which got dropped from upstream.

This is problematic, because, in a .hash file, we can't store two
different hashes for the same file. We've started to handle this case by
moving the licenses hashes to the per-version sub directories.

However, the hashes for the downloads are still stored inside the non-
versioned hash file of the package, which is not totally coherent: if we
have a per-version hash file, it should list all the hases for that
version, downloads included, and there should be no unversioned hash
file.

In preparation for this, we duplicate the downloads hashes from the main
hash files, and into the versioned ones. Once the download infra learns
to look for those hashes in these per-version subdirs, we'll remove the
unversioned hash files.

Note that, now that we have versioned hash files, the main hash files
will not be used to check license files, so we can already drop the
hashes for license files from the main hash files.

Note also that there are a few other packages for which we support
different versions (binutils, gcc, gdb, lua, xserver_xorg-server,
uboot), but none of those have different licensing terms due to the
version. Qt5 and glibc are alone in this case.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Gaël Portay <gael.portay@savoirfairelinux.com>
Cc: Peter Seiderer <ps.report@gmx.net>
Cc: Julien Corjon <corjon.j@ecagroup.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Luca Ceresoli <luca@lucaceresoli.net>
Cc: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>