use our standard declaration macro for the AP_DEBUG flavors of

ap_strchr(), ap_strchr_c(), et al so that for an AP_DEBUG build
of Apache those functions will be listed in httpd.exp...  otherwise,
AIX DSO modules also compiled with AP_DEBUG won't be able to resolve
those symbols since httpd isn't exporting them


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92270 13f79535-47bb-0310-9956-ffa450edef68