AIX has no WCOREDUMP()

src/os/unix/ngx_process.c

diff --git a/src/os/unix/ngx_process.c b/src/os/unix/ngx_process.c
index ca3eae1..18b2601 100644
--- a/src/os/unix/ngx_process.c
+++ b/src/os/unix/ngx_process.c
@@ -494,10 +494,16 @@
         }
 
         if (WTERMSIG(status)) {
+#ifdef WCOREDUMP
             ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
                           "%s %P exited on signal %d%s",
                           process, pid, WTERMSIG(status),
                           WCOREDUMP(status) ? " (core dumped)" : "");
+#else
+            ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
+                          "%s %P exited on signal %d",
+                          process, pid, WTERMSIG(status));
+#endif
 
         } else {
             ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,