Switch Skia's libjpeg-turbo to 1.4.2

The Android security team wants Android to be on the latest version
of libjpeg-turbo, so Skia should test on this version as well.

This shouldn't affect Gold.

I wouldn't be surprised if this causes a few ASAN/valgrind issues
that we need to fix.

BUG=skia:

Review URL: https://codereview.chromium.org/1469553002
2 files changed