Remove unused system header includes

None of these headers were necessary to include, some because they are
already included by postgres.h and others because we have removed the
functions which we used to use from them.

Author: jeltz

contrib/pg_tde/src/access/pg_tde_tdemap.c

@@ -2,7 +2,6 @@
 
 #include <openssl/err.h>
 #include <openssl/rand.h>
-#include <unistd.h>
 
 #include "access/xlog.h"
 #include "access/xlog_internal.h"

contrib/pg_tde/src/catalog/tde_keyring.c

@@ -12,8 +12,6 @@
 
 #include "postgres.h"
 
-#include <unistd.h>
-
 #include "access/skey.h"
 #include "access/xlog.h"
 #include "access/xloginsert.h"

contrib/pg_tde/src/encryption/enc_aes.c

@@ -1,15 +1,7 @@
 #include "postgres.h"
 
-#include <errno.h>
-#include <fcntl.h>
-#include <openssl/crypto.h>
 #include <openssl/err.h>
 #include <openssl/evp.h>
-#include <openssl/ssl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
 
 #include "encryption/enc_aes.h"
 

contrib/pg_tde/src/keyring/keyring_api.c

@@ -1,6 +1,5 @@
 #include "postgres.h"
 
-#include <assert.h>
 #include <openssl/err.h>
 #include <openssl/rand.h>
 

contrib/pg_tde/src/keyring/keyring_file.c

@@ -12,9 +12,6 @@
 
 #include "postgres.h"
 
-#include <stdio.h>
-#include <unistd.h>
-
 #include "common/file_perm.h"
 #include "storage/fd.h"
 #include "utils/wait_event.h"

contrib/pg_tde/src/keyring/keyring_vault.c

@@ -12,7 +12,6 @@
 #include "postgres.h"
 
 #include <curl/curl.h>
-#include <stdio.h>
 
 #include "common/base64.h"
 #include "common/jsonapi.h"