sys/linux/test: test case for bpf_tail_call helper

This test case corresponds to the BPF program below (bcc syntax for the
map).

    BPF_PROG_ARRAY(prog_array, 10);
    int tail_call_prog(void *ctx) {
        char str[8] = {0};
        u64 data = 0x1234;
        bpf_snprintf(str, sizeof(str), "%d     ", &data, sizeof(data));
        return 0;
    }
    int do_tail_call(void *ctx) {
        prog_array.call(ctx, 0);
        return 0;
    }

It reuses the program defined to test bpf_snprintf, as the target of the
tail call.

Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>

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