Test

Remove `Error` enumeration from libbpf-cargo #834

Job	Run time
Build capable example with static libelf and libz	46s
Test [stable, dev]	2m 34s
Build for aarch64	1m 7s
Test [nightly, dev]	2m 29s
Build for aarch32	1m 8s
Test [stable, release]	3m 11s
Build using minimum versions of dependencies	5m 3s
Check documentation	44s
Lint with clippy	4m 54s
Check code formatting	14s
	22m 10s

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