Bundling the two widenings: four call sites pass &stream.avail_in
directly to use_pack(), and widening either type fencepost alone
would force a bridge variable at each. Doing both together is the
simpler end state and is the prerequisite for the do_compress()
widening in the next commit, which is what lets
write_no_reuse_object() lose its last cast_size_t_to_ulong() shim.
The unsigned-long locals widened at the other use_pack() callers
(avail / remaining / left) hold pack-window sizes bounded by
core.packedGitWindowSize, so the change is type consistency rather
than a new >4GB capability. git_zstream.avail_in / avail_out
likewise reach zlib's uInt fields only after zlib_buf_cap()'s 1 GiB
cap, so the wrapper already accepted size_t-shaped inputs in
practice.
Assisted-by: Opus 4.7
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
406f6752aa