samples: bpf: Don't fail for a missing VMLINUX_BTF when VMLINUX_H is provided
samples/bpf build currently always fails if it can't generate vmlinux.h from vmlinux, even when vmlinux.h is directly provided by VMLINUX_H variable, which makes VMLINUX_H pointless. Only fails when neither method works. Fixes: 384b6b3b ("samples: bpf: Add vmlinux.h generation support") Reported-by: CKI Project <cki-project@redhat.com> Reported-by: Veronika Kabatova <vkabatov@redhat.com> Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220507161635.2219052-1-jmarchan@redhat.com
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