selftests/bpf: make directory prerequisites order-only
When directories are used as prerequisites in Makefiles, they can cause a lot of unnecessary rebuilds, because a directory is considered changed whenever a file in this directory is added, removed or modified. If the only thing a target is interested in is the existence of the directory it depends on, which is the case for selftests/bpf, this directory should be specified as an order-only prerequisite: it would still be created in case it does not exist, but it would not trigger a rebuild of a target in case it's considered changed. Signed-off-by: NIlya Leoshkevich <iii@linux.ibm.com> Acked-by: NAndrii Nakryiko <andriin@fb.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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