calculate VHostID length at startup rather than request time.

change ap_md5() call in ssl_hook_pre_connection() to ap_md5_binary()
that uses the precalculated sc->nVHostID_length to avoid a strlen() call.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@92216 13f79535-47bb-0310-9956-ffa450edef68