libbpf: Ensure new BTF objects inherit input endianness

New split BTF needs to preserve base's endianness. Similarly, when
creating a distilled BTF, we need to preserve original endianness.

Fix by updating libbpf's btf__distill_base() and btf_new_empty() to retain
the byte order of any source BTF objects when creating new ones.

Fixes: ba451366bf44 ("libbpf: Implement basic split BTF support")
Fixes: 58e185a0dc35 ("libbpf: Add btf__distill_base() creating split BTF with distilled base BTF")
Reported-by: Song Liu <[email protected]>
Reported-by: Eduard Zingerman <[email protected]>
Suggested-by: Eduard Zingerman <[email protected]>
Signed-off-by: Tony Ambardar <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Tested-by: Alan Maguire <[email protected]>
Acked-by: Eduard Zingerman <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]/
Link: https://lore.kernel.org/bpf/[email protected]

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