Update piex and add test image

Bug: oss-fuzz:6347

Change-Id: Iacf8c7a1677f2651e5c211cffb09eecb388a5f8a
Reviewed-on: https://skia-review.googlesource.com/109400
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
1 file changed