add a libjpeg test

This tests for a bug in libjpeg where INT32 is typedefed to long
and memory is written to outside of the array.

BUG=skia:2791
R=djsollen@google.com, mtklein@google.com

Author: halcanary@google.com

Review URL: https://codereview.chromium.org/435753002
1 file changed