Set up a Linux repo the way sync-kernel.sh expects it: HEAD at
bpf-next's master and a bpf-master branch at bpf's master.
Fetch full history of both trees from the kernel-patches/bpf mirror on
GitHub, which is more reliable than git.kernel.org. The mirror may lag
behind, so don't require its branches to match git.kernel.org exactly,
only check that they're in the history of the master branches there.
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
