Update to the latest version of libjpeg-turbo

Bug: b/70203010

From https://github.com/libjpeg-turbo/libjpeg-turbo/commit/c308d434.
This commit fixes a bug in BitmapRegionDecoder, and is the tip of tree.

Rather than using our mirror, just pull in upstream directly. Move our
config files into third_party/libjpeg-turbo, so we can just DEPS to
upstream. These files are unchanged, except jconfig.h, where I added a
comment regarding arithmetic coding.

Add a test image which demonstrates the bug.

Change-Id: I00f8f961f69e407dc31ca6d15c66518aa0acbafd
Reviewed-on: https://skia-review.googlesource.com/81442
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Leon Scroggins <scroggo@google.com>
7 files changed