bpftool: Print ENOTSUPP as "Operation not supported"

Some BPF commands return ENOTSUPP (524) to user space: iterating local
storage maps, element operations on ringbuf maps, creating an LRU hash
map without preallocation, freezing a struct_ops map, or running a
program type that has no test_run. ENOTSUPP is kernel internal, so
strerror() only gives "Unknown error 524":

  # bpftool map getnext pinned /sys/fs/bpf/sk_storage
  Error: can't get next key: Unknown error 524

Add a small helper that knows ENOTSUPP and use it where bpftool prints
the error of map create, map element operations, map freeze and prog
run.

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Maxim Skokov <skokovmaksimevg@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Quentin Monnet <qmo@kernel.org>
Link: https://patch.msgid.link/20261016194825.230433-2-skokovmaksimevg@gmail.com

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