[zlib] Re-sync with zlib 1.2.12, patch 7 of N

Ported:
- Fix deflateEnd() to not report an error at start of raw deflate
- Emphasize the need to continue decompressing gzip members
- Correct the initialization requirements for deflateInit2()
- Assure that the number of bits for deflatePrime() is valid

Bug: 1032721
Change-Id: I6c1cbf67b8c983ddc4481a445982f226bc97ceb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3573054


Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#989437}
NOKEYCHECK=True
GitOrigin-RevId: eb8415cd3f004003fbadc5152d52b22ad0b843b4