Moving zlib patches to a new folder

The idea is to help avoid constant merge conflicts in new patches
on top of Chromium's zlib.

Plus adding instructions on how to generate a patch file.

Bug: 764094
Change-Id: I90260c7b6514171c4cc927a0299acf82b4ca6c2b
Reviewed-on: https://chromium-review.googlesource.com/677495
Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#503523}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: e4fd3cb6f5a3998fef542abb432dc39352708a3c
6 files changed