Repair C++ compatibility in ap_config.h, apr_file_io.h,

apr_network_io.h, and apr_thread_proc.h.
Submitted by:	Tyler J. Brooks <tylerjbrooks@home.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85613 13f79535-47bb-0310-9956-ffa450edef68