Merge branch 'jk/unused-annotation'

Annotate function parameters that are not used (but cannot be removed for structural reasons), to prepare us to later compile with -Wunused warning turned on. * jk/unused-annotation: is_path_owned_by_current_uid(): mark "report" parameter as unused run-command: mark unused async callback parameters mark unused read_tree_recursive() callback parameters hashmap: mark unused callback parameters config: mark unused callback parameters streaming: mark unused virtual method parameters transport: mark bundle transport_options as unused refs: mark unused virtual method parameters refs: mark unused reflog callback parameters refs: mark unused each_ref_fn parameters git-compat-util: add UNUSED macro