selftests/bpf: Add custom SEC() handling selftest

Add a selftest validating various aspects of libbpf's handling of custom
SEC() handlers. It also demonstrates how libraries can ensure very early
callbacks registration and unregistration using
__attribute__((constructor))/__attribute__((destructor)) functions.

Signed-off-by: Andrii Nakryiko <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Tested-by: Alan Maguire <[email protected]>
Reviewed-by: Alan Maguire <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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