seg: Add test "security" in meson.build

Oversight in 681d9e4621aa where the test has been added.

Reported-by: Justin Pryzby
Discussion: https://postgr.es/m/ZK5AgYxG4zLErD5O@telsasoft.com
Backpatch-through: 16

contrib/seg/meson.build

@@ -53,6 +53,7 @@ tests += {
   'bd': meson.current_build_dir(),
   'regress': {
     'sql': [
+      'security',
       'seg',
     ],
   },

src/backend/port/win32/socket.c

@@ -303,6 +303,7 @@ pgwin32_socket(int af, int type, int protocol)
 	if (ioctlsocket(s, FIONBIO, &on))
 	{
 		TranslateSocketError();
+		closesocket(s);
 		return INVALID_SOCKET;
 	}
 	errno = 0;

src/backend/utils/activity/backend_status.c

@@ -263,9 +263,9 @@ pgstat_beinit(void)
 		 * Assign the MyBEEntry for an auxiliary process.  Since it doesn't
 		 * have a BackendId, the slot is statically allocated based on the
 		 * auxiliary process type (MyAuxProcType).  Backends use slots indexed
-		 * in the range from 1 to MaxBackends (inclusive), so we use
+		 * in the range from 0 to MaxBackends (exclusive), so we use
-		 * MaxBackends + AuxBackendType + 1 as the index of the slot for an
+		 * MaxBackends + AuxProcType as the index of the slot for an auxiliary
-		 * auxiliary process.
+		 * process.
 		 */
 		MyBEEntry = &BackendStatusArray[MaxBackends + MyAuxProcType];
 	}