replace strlen(cpVHostMD5) with MD5_DIGESTSIZE*2 in ssl_hook_pre_connection()

since we know the string returned by ap_md5() will always be that length
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@92213 13f79535-47bb-0310-9956-ffa450edef68