ldap_set_option LDAP_OPT_RESTART to handle EINTR on SIGCHLD from CGI
(ldap uses poll(), which is not restartable with sigaction SA_RESTART)
"mod_authn_ldap/mod_cgi race condition, "Can't contact LDAP server""
code reuse, simplification, and inlining
remove excess calls to chunkqueue_remove_finished_chunks()
(it may still be possible for there to be an empty chunk in chunkqueue
if nothing were written to a temporary file (need to verify this), so
preserve some calls to chunkqueue_remove_finished_chunks() for now)
sys/event.h does not compile standalone, so check_include_files() fails
Add compiler flags -include sys/types.h so that the compile check passes
This allows cmake builds on FreeBSD to detect and use kqueue.