move c->notes.ssl::verify::depth to SSLConnRec.verify_depth

note: may actually be removed unless somebody can figure out why it is in
there to begin with
PR:
Obtained from:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@92111 13f79535-47bb-0310-9956-ffa450edef68