Check whether cargo exists and disable the blazesym feature. #4227
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See #4223, Instead of having this change, maybe we can check whether cargo exists and disable the blazesym feature if not. @chenhengqi
Like we do in libbpf-bootstrap:
https://github.com/libbpf/libbpf-bootstrap/blob/938651fcef787f3885b7c32792851f8423bf8421/examples/c/Makefile#L24-L32