Add the needed logic in ap_snprint to handle

quads (long longs). Note that we depend on AP_LONGEST_LONG being
set correctly. This change does not effect the current operation
of ap_snprintf, so it's OK to add right now while we work on
the rest of it


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@83230 13f79535-47bb-0310-9956-ffa450edef68