Link the shared core bootstrap program (``SHARED_CORE'') also against libap.a

and use it's ap_snprintf() instead of sprintf() to avoid possible buffer
overflows.

Hint given by: John Bley <jbb6@acpub.duke.edu>
Submitted by: Ralf S. Engelschall


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82885 13f79535-47bb-0310-9956-ffa450edef68