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This adds the custom malloc/free functions from the old
libpng_read_fuzzer to the upstream fuzzer to prevent clusterfuzz running
into OOM.

Bug: 904054
Change-Id: Ibb824beb191cb5657687c55ee2db8c7783547bad
Reviewed-on: https://chromium-review.googlesource.com/c/1330936
Commit-Queue: Christopher Thompson <cthomp@chromium.org>
Reviewed-by: Leon Scroggins <scroggo@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607622}