tests: check BPF_OBJ_GET_INFO_BY_FD decoding

tests: check BPF_OBJ_GET_INFO_BY_FD decoding

* tests/bpf-obj_get_info_by_fd-prog-v.c: New file.
* tests/bpf-obj_get_info_by_fd-prog.c: Likewise.
* tests/bpf-obj_get_info_by_fd-v.c: Likewise.
* tests/bpf-obj_get_info_by_fd.c: Likewise.
* configure.ac (AC_CHECK_HEADERS): Check for struct bpf_insn,
struct bpf_map_info, and struct bpf_prog_info.
* tests/pure_executables.list: Add bpf-obj_get_info_by_fd,
bpf-obj_get_info_by_fd-v, bpf-obj_get_info_by_fd-prog, and
bpf-obj_get_info_by_fd-prog-v.
* tests/.gitignore: Likewise.
* tests/gen_tests.in (bpf-obj_get_info_by_fd,
bpf-obj_get_info_by_fd-v, bpf-obj_get_info_by_fd-prog,
bpf-obj_get_info_by_fd-prog-v): New tests.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>