Deprecate FILE_BINARY and FILE_TEXT constants

These constants have no effect.

Part of https://wiki.php.net/rfc/deprecations_php_8_1.

UPGRADING

@@ -355,10 +355,13 @@ PHP 8.1 UPGRADE NOTES
     RFC: https://wiki.php.net/rfc/phase_out_serializable
 
 - Standard:
-  . Calling  key(), current(), next(), prev(), reset(), or end() on objects
+  . Calling key(), current(), next(), prev(), reset(), or end() on objects
     is deprecated. Instead cast the object to array first, or make use of
     ArrayIterator.
     RFC: https://wiki.php.net/rfc/deprecations_php_8_1
+  . The FILE_BINARY and FILE_TEXT constants are deprecated. They already had
+    no effect previously.
+    RFC: https://wiki.php.net/rfc/deprecations_php_8_1
 
 ========================================
 5. Changed Functions

ext/standard/file.c

@@ -300,8 +300,8 @@ PHP_MINIT_FUNCTION(file)
 	REGISTER_LONG_CONSTANT("FILE_APPEND",					PHP_FILE_APPEND,					CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("FILE_NO_DEFAULT_CONTEXT",		PHP_FILE_NO_DEFAULT_CONTEXT,		CONST_CS | CONST_PERSISTENT);
 
-	REGISTER_LONG_CONSTANT("FILE_TEXT",						0,									CONST_CS | CONST_PERSISTENT);
-	REGISTER_LONG_CONSTANT("FILE_BINARY",					0,									CONST_CS | CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("FILE_TEXT",						0,									CONST_CS | CONST_PERSISTENT | CONST_DEPRECATED);
+	REGISTER_LONG_CONSTANT("FILE_BINARY",					0,									CONST_CS | CONST_PERSISTENT | CONST_DEPRECATED);
 
 #ifdef HAVE_FNMATCH
 	REGISTER_LONG_CONSTANT("FNM_NOESCAPE", FNM_NOESCAPE, CONST_CS | CONST_PERSISTENT);

ext/standard/tests/file/file_binary_text_deprecated.phpt

@@ -0,0 +1,15 @@
+--TEST--
+The FILE_BINARY and FILE_TEXT constants are deprecated
+--FILE--
+<?php
+
+var_dump(FILE_BINARY);
+var_dump(FILE_TEXT);
+
+?>
+--EXPECTF--
+Deprecated: Constant FILE_BINARY is deprecated in %s on line %d
+int(0)
+
+Deprecated: Constant FILE_TEXT is deprecated in %s on line %d
+int(0)