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.

PR:
Obtained from:
Submitted by:
Reviewed by:


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