Fixed --test-build-eventport on macOS 10.12 and later.
In macOS 10.12, CLOCK_REALTIME and clockid_t were added, but not timer_t.
diff --git a/src/event/modules/ngx_eventport_module.c b/src/event/modules/ngx_eventport_module.c
index e723f92..01cfc97 100644
--- a/src/event/modules/ngx_eventport_module.c
+++ b/src/event/modules/ngx_eventport_module.c
@@ -19,6 +19,8 @@
#define CLOCK_REALTIME 0
typedef int clockid_t;
typedef void * timer_t;
+#elif (NGX_DARWIN)
+typedef void * timer_t;
#endif
/* Solaris declarations */