fixed const for d2i_ASN1_type_bytes() usage.

Not sure if 0.9.8 is correct, but checked that 0.9.7m doesnt have const.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@965311 13f79535-47bb-0310-9956-ffa450edef68