Fixing nagios 4.2 comment type rename

Author: jbreams

configure.ac

@@ -119,6 +119,11 @@ AC_CHECK_DECL([delete_downtime_by_hostname_service_description_start_time_commen
 AC_CHECK_DECL([shutdown_command_file_worker],
     AC_DEFINE([HAVE_SHUTDOWN_COMMAND_FILE_WORKER], [], [Have shutdown_command_file_worker function]),
     [], [#include <nagios.h>])
+
+AC_CHECK_TYPE([nagios_comment],
+    [AC_DEFINE([HAVE_NAGIOS_COMMENT_TYPE], [], [Have nagios 4.2 comment type])],
+    [], [#include <comments.h>])
+
 CFLAGS=$CFLAGS_BAK
 
 AC_SUBST([libpcre_LIBS])

mods/common.h

@@ -19,3 +19,7 @@ int handle_pubstartup(json_t * def);
 #   define ZMQ_POLL_MSEC    1           //  zmq_poll is msec
 #endif
 
+#ifdef HAVE_NAGIOS_COMMENT_TYPE
+#include <comments.h>
+typedef nagios_comment comment;
+#endif