Tried to centralize global variable registration as much as possible:

- Added $HTTP_ENV_VARS[] and $HTTP_SERVER_VARS[] support, which similarly
  to $HTTP_GET_VARS[], contain environment and server variables.  Setting
  register_globals to Off will now also prevent registration of the
  environment and server variables into the global scope (Zeev)
- Renamed gpc_globals to register_globals (Zeev)
- Introduced variables_order that deprecates gpc_order, and allows control
  over the server and environment variables, in addition to GET/POST/Cookies
  (Zeev)

main/SAPI.h

@@ -147,6 +147,8 @@ struct _sapi_module_struct {
 	int (*read_post)(char *buffer, uint count_bytes SLS_DC);
 	char *(*read_cookies)(SLS_D);
 
+	void (*register_server_variables)(zval *track_vars_array ELS_DC SLS_DC PLS_DC);
+
 	void (*default_post_reader)(char *content_type_dup SLS_DC);
 };