Include some missing headers.

Per headerscheck on BF animal crake, and Andres.

Discussion: https://postgr.es/m/20220407083630.n62vgwqfy2v6wsrd%40alap3.anarazel.de

Author: macdice

src/include/access/xlogprefetcher.h

@@ -14,6 +14,8 @@
 #define XLOGPREFETCHER_H
 
 #include "access/xlogdefs.h"
+#include "access/xlogreader.h"
+#include "access/xlogrecord.h"
 
 /* GUCs */
 extern int	recovery_prefetch;