[zlib] Re-sync with zlib 1.2.12, patch 6 of N

Ported:
- Avoid undefined behaviors of memcpy() in gz*printf()
- Avoid an undefined behavior of memcpy() in _tr_stored_block()
- Make the names in functions declarations identical to definitions

Bug: 1032721
Change-Id: I0c7aa9d175448f8753e640b91bb31c3d971248e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3570083


Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#988707}
NOKEYCHECK=True
GitOrigin-RevId: 549a9f374a48c8cc6ec92552de8648107c6b5d71