[PATCH v3 0/3] delta-islands: avoid unused function messages

the macro generated code from delta-islands (using khash) triggers some unused function warnings in macOS, OpenBSD and some linux with a newer version of clang because of its use of static functions.

Changes from v2:
* Relay in the C code including git-compat-util as suggested by Jeff
* Commit message cleanup
* Make changes hdr-check clean

Changes from v1:
* Use MAYBE_UNUSED for all cases as suggested by Duy

Carlo Marcelo Arenas Belón (3):
  commit-slab: move MAYBE_UNUSED into git-compat-util
  khash: silence -Wunused-function in delta-islands from khash
  commit-slab: missing definitions and forward declarations (hdr-check)

 commit-slab-impl.h | 4 ++--
 commit-slab.h      | 2 ++
 git-compat-util.h  | 2 ++
 khash.h            | 2 +-
 4 files changed, 7 insertions(+), 3 deletions(-)