[fuzz] Fix CI Fuzz build process

The build process was broken a few weeks ago and never fixed.

Thanks to metzman@ for the suggested fix!

Change-Id: Id3e0370896cd59b72b484accae107a2e0c9d36e1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/343896
Reviewed-by: Kevin Lubick <kjlubick@google.com>
2 files changed