ci: Drop ppc64le COPR builds from presubmits

These are failing due to infra issues apparently, and
we have coverage at release time, we really don't
need to build every single PR by default.

Signed-off-by: Colin Walters <walters@verbum.org>

.packit.yaml

@@ -36,15 +36,12 @@ jobs:
       # for all architectures
       - centos-stream-9-x86_64
       - centos-stream-9-aarch64
-      - centos-stream-9-ppc64le
       - centos-stream-9-s390x
       - centos-stream-10-x86_64
       - centos-stream-10-aarch64
-      - centos-stream-10-ppc64le
       - centos-stream-10-s390x
       - fedora-41-x86_64
       - fedora-41-aarch64
-      - fedora-41-ppc64le
       - fedora-41-s390x
       # Sanity check on secondary targets, fewer architectures just
       # because the chance that we break e.g. ppc64le *just* on