Add a CentOS 7.8 repo file because we reference RPMs from it in
some of the .lst files. This fixes build breakage caused by:
5fdf687 CVE-2018-18751 Fix
CentOS 7.8 is fairly recent and hasn't been migrated to the vault
yet (except for source RPMs). So we pull the files from these
locations:
http://mirror.centos.org/centos/7.8.2003 (binraries)
http://vault.centos.org/7.8.2003/ (sources)
Change-Id: Iedcdf52d2b826d430e640d28f028ea99eaeb3244
Signed-off-by: Davlet Panech <davlet.panech@windriver.com>