support/check-package: don't check filenames of hashes

support/check-package: don't check filenames of hashes

Currently, we check that the filenames in hash lists do not contain
a slash '/' character, because all we are checking so far are the
downloaded archives, and we explicitly need the filename to not contain
a directory component at all.

However, we're soon to also check the hashes of the license files in
packages sources, and those license files may be at any arbitrary
directory-depth in the packages source tree.

[Peter: Remove reference to files with same basename]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Luca Ceresoli <luca@lucaceresoli.net>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Cc: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Acked-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>