include/ap_compat.h tested and set APR_COMPAT_H instead of AP_COMPAT_H.

This prevented the inclusion of apr_compat.h.

PR:           7773
Submitted by: Oleg Broytmann <phd@phd.pp.ru>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89217 13f79535-47bb-0310-9956-ffa450edef68