selftests/bpf: Clone a program that calls a module kfunc

Prepare an object whose program calls a kfunc of bpf_testmod and load
the program through bpf_program__clone(), the way veristat loads
programs. The module BTF fd sits in slot 1 of the fd_array of the
object and slot 0 is empty; the clone used to pass the fill index of
that array as fd_array_cnt, which made the kernel resolve slot 0 and
fail the load with "fd 0 is not pointing to valid bpf_map or btf".

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20261019132203.3034698-5-memxor@gmail.com

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