bpftool: Bpf skeletons assert type sizes

When emitting type declarations in skeletons, bpftool will now also emit
static assertions on the size of the data/bss/rodata/etc fields. This
ensures that in situations where userspace and kernel types have the same
name but differ in size we do not silently produce incorrect results but
instead break the build.

This was reported in [1] and as expected the repro in [2] fails to build
on the new size assert after this change.

  [1]: Closes: https://github.com/libbpf/libbpf/issues/433
  [2]: https://github.com/fuweid/iovisor-bcc-pr-3777

Signed-off-by: Delyan Kratunov <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Tested-by: Hengqi Chen <[email protected]>
Acked-by: Hengqi Chen <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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