audit: bump to version 2.7.8

audit: bump to version 2.7.8

Commit d1011f89a18 (audit: update legal info) set the libraries license
to "unclear" because of GPL license text in a few libraries source
files. Upstream audit package commit 239765162fa494 (Correct the
licensing description in lib/ and auparse/ to be LGPL as was always
intended) clarified the license in these files.

Add license files hashes.

Cc: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Cc: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>