Include required headers

Make sure to include all required header files to silence compilers
that are picky about that.

src/backend/cdb/cdbhash.c

@@ -15,6 +15,8 @@
  */
 #include "postgres.h"
 
+#include <sys/socket.h>
+
 #include "access/tuptoaster.h"
 #include "utils/builtins.h"
 #include "catalog/pg_type.h"

src/backend/cdb/cdbtm.c

@@ -15,6 +15,7 @@
 #include "postgres.h"
 
 #include <time.h>
+#include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 

src/backend/commands/copy.c

@@ -22,6 +22,7 @@
 #include <ctype.h>
 #include <unistd.h>
 #include <sys/stat.h>
+#include <sys/wait.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 

src/backend/fts/ftsmessagehandler.c

@@ -13,6 +13,9 @@
  */
 #include "postgres.h"
 
+#include <sys/stat.h>
+#include <unistd.h>
+
 #include "libpq/pqformat.h"
 #include "libpq/libpq.h"
 #include "postmaster/fts.h"
@@ -21,7 +24,6 @@
 #include "utils/guc.h"
 #include "replication/gp_replication.h"
 #include "storage/fd.h"
-#include <unistd.h>
 
 #define FTS_PROBE_FILE_NAME "fts_probe_file.bak"
 #define FTS_PROBE_MAGIC_STRING "FtS PrObEr MaGiC StRiNg, pRoBiNg cHeCk......."

src/include/cdb/cdbinterconnect.h

@@ -15,6 +15,7 @@
 #ifndef CDBINTERCONNECT_H
 #define CDBINTERCONNECT_H
 
+#include "libpq/libpq-be.h"
 #include "nodes/primnodes.h"
 #include "cdb/tupchunklist.h"
 #include "access/htup.h"