libbpf: Allow version suffixes (___smth) for struct_ops types

E.g. allow the following struct_ops definitions:

    struct bpf_testmod_ops___v1 { int (*test)(void); };
    struct bpf_testmod_ops___v2 { int (*test)(void); };

    SEC(".struct_ops.link")
    struct bpf_testmod_ops___v1 a = { .test = ... }
    SEC(".struct_ops.link")
    struct bpf_testmod_ops___v2 b = { .test = ... }

Where both bpf_testmod_ops__v1 and bpf_testmod_ops__v2 would be
resolved as 'struct bpf_testmod_ops' from kernel BTF.

Signed-off-by: Eduard Zingerman <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Acked-by: David Vernet <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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