27e8960037
Before including <zlib.h> we explicitly define `z_const` to an empty
value. This has the effect that the `z_const` macro in "zconf.h" itself
will remain empty instead of being defined as `const`, which effectively
adapts a couple of APIs so that their parameters are not marked as being
constants.
It is dubious though whether this is something we actually want: not
marking a parameter as a constant doesn't make it any less constant than
it was. The define was added via 07564773c2 (compat: auto-detect if zlib
has uncompress2(), 2022-01-24), where it was seemingly carried over from
our internal compatibility shim for `uncompress2()` that was removed in
the preceding commit. The commit message doesn't mention why we carry
over the define and make it public, either, and I cannot think of any
reason for why we would want to have it.
Drop the define.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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