Make storage/standby.h compile standalone again.

tglsfdc · tglsfdc · commit a4b03de589c1 · 2021-01-24T18:08:55.000-05:00
This file has failed headerscheck/cpluspluscheck verification since commit 0650ff2, as a result of referencing typedef TimestampTz without including the appropriate header.
diff --git a/src/include/storage/standby.h b/src/include/storage/standby.h
@@ -14,6 +14,7 @@
 #ifndef STANDBY_H
 #define STANDBY_H
 
+#include "datatype/timestamp.h"
 #include "storage/lock.h"
 #include "storage/procsignal.h"
 #include "storage/relfilenode.h"
