resolve_btfids: Always build with -Wall -Werror

resolve_btfids: Always build with -Wall -Werror

resolve_btfids builds without compiler warnings currently, so let's
enforce this for future changes with '-Wall -Werror' flags [1].

[1] https://lore.kernel.org/bpf/1957a60b-6c45-42a7-b525-a6e335a735ff@linux.dev/

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Alan Maguire <alan.maguire@oracle.com>
Link: https://lore.kernel.org/bpf/20251219181321.1283664-5-ihor.solodrai@linux.dev