First pass of streamlining X509_STORE_get1_{certs,crls}()

These functions are quite messy. On top of the tricky logic querying the
cache, then refreshing the cache (unconditionally or not), then querying
again, then extracting a list of certs/crls and bumping their refcounts,
things are intermixed with locking and needlessly early allocations that
then need to be cleaned up again.

Use X509_STORE_CTX_get_obj_by_subject() to avoid using an object on the
stack and defer allocation of the returned stack of certs to later.
Flatten the logic a bit and prepare for further refactoring.

ok jsing

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