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The flag is used in the pathbuilder impl in cert_verify_tool, and
will also be useful in unittests.

Change-Id: I4613701d01a1e4e96bcfd8501074ecdb965150da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894104Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Commit-Queue: Matt Mueller <mattm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711493}