Revert "Implement #67331: Have parse_ini_file add empty entries"

This reverts commit 3f3e914.

The commit broke some tests on Windows, and generally needs more
though.

Author: cmb69

NEWS

@@ -2,9 +2,6 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? ????, PHP 7.4.0alpha1
 
-- Core:
-  . Implemented request #67331 (Have parse_ini_file add empty entries). (cmb)
-
 - Intl:
   . Lifted requirements to ICU ≥ 50.1. (cmb)
   . Changed default of $variant parameter of idn_to_ascii() and idn_to_utf8().

UPGRADING

@@ -73,10 +73,6 @@ PHP 7.4 UPGRADE NOTES
 11. Changes to INI File Handling
 ========================================
 
-- General:
-  . Keys without values can now omit the equals sign, in which case they are
-    parsed as NULL instead of an empty string.
-
 ========================================
 12. Windows Support
 ========================================

Zend/zend_ini_parser.y

@@ -342,24 +342,7 @@ statement:
 			zval_ini_dtor(&$2);
 			zval_ini_dtor(&$5);
 		}
-	|	TC_OFFSET option_offset ']' {
-			zval arg2;
-
-#if DEBUG_CFG_PARSER
-			printf("OFFSET: '%s'[%s] = NULL\n", Z_STRVAL($1), Z_STRVAL($2));
-#endif
-			ZVAL_NULL(&arg2);
-			ZEND_INI_PARSER_CB(&$1, &arg2, &$2, ZEND_INI_PARSER_POP_ENTRY, ZEND_INI_PARSER_ARG);
-			zend_string_release(Z_STR($1));
-			zval_ini_dtor(&$2);
-		}
-	|	TC_LABEL {
-			zval arg2;
-
-			ZVAL_NULL(&arg2);
-			ZEND_INI_PARSER_CB(&$1, &arg2, NULL, ZEND_INI_PARSER_ENTRY, ZEND_INI_PARSER_ARG);
-			zend_string_release(Z_STR($1)); 
-		}
+	|	TC_LABEL	{ ZEND_INI_PARSER_CB(&$1, NULL, NULL, ZEND_INI_PARSER_ENTRY, ZEND_INI_PARSER_ARG); zend_string_release(Z_STR($1)); }
 	|	END_OF_LINE
 ;