build: Fix generating BTF with pahole >=1.24
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2148429
Upstream status: RHEL-only
RHEL9 now has pahole 1.24 which contains BTF enum64 support that has not
yet been backported into the kernel. Hence, we need to pass
--skip_encoding_btf_enum64
to pahole during the build to avoid errors
while generating BTF information.
Signed-off-by: Viktor Malik vmalik@redhat.com