selftests/bpf: Test "bpftool gen min_core_btf"

This commit reuses the core_reloc test to check if the BTF files
generated with "bpftool gen min_core_btf" are correct. This introduces
test_core_btfgen() that runs all the core_reloc tests, but this time
the source BTF files are generated by using "bpftool gen min_core_btf".

The goal of this test is to check that the generated files are usable,
and not to check if the algorithm is creating an optimized BTF file.

Signed-off-by: Mauricio Vásquez <[email protected]>
Signed-off-by: Rafael David Tinoco <[email protected]>
Signed-off-by: Lorenzo Fontana <[email protected]>
Signed-off-by: Leonardo Di Donato <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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