make,cross: ignore loong64 from target list
make,cross: ignore loong64 from target list

Released and used version of https://github.com/etcd-io/bbolt/tree/v1.3.6
does not defines certain constants for `loong64` ARCH so avoid building
for `loong64` in `make cross` and `cross-build` CI test.

Remove this commit once `v1.3.7` is out since this is fixed on master
branch.

[NO NEW TESTS NEEDED]
[NO TESTS NEEDED]

Signed-off-by: Aditya R <4f9683854fe0b71db89677d592545c6b565c2266@redhat.com>

TomSweeneyRedHat/buildah,TomSweeneyRedHat/buildah,TomSweeneyRedHat/buildah,nalind/buildah-1,nalind/buildah-1,nalind/buildah-1