resolution of symbols. It does guard with #ifdefs but since it doesn't
record a hard dependency on the libssl version, an installed package
doesn't automatically get updated to a newer version that notices the
change, so bump qt5's REVISION-main to force an update.
It does fallback sensibly (no crash, just a Warning printf), but since
the change to headers results in a code change to Qt, we need to bump.
Noticed while testing the otter-browser udpate.
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