This change fixes a variety of build warnings on Android. In a related
change, the CA verifier preference allows using a list of certificate
overrides and the `rust-webpki` verifier regardless of platform. Whether
to use a list of certificate overrides and whether to use the platform
verifier are orthagonal, so this change unlinks those two and in the
process
fixes a build warning on Android.
Testing: This preference is untested (and quite hard to test honestly),
so this change
does not have tests. There should be no behavior change unless using a
combination
of forcing the webpki verifier and providing a list of CA overrides.
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Signed-off-by: Martin Robinson <mrobinson@igalia.com>