patch 8.2.4050: Vim9: need to prefix every item in an autoload script

Problem:    Vim9: need to prefix every item in an autoload script.
Solution:   First step in supporting "vim9script autoload" and "import
            autoload".
diff --git a/src/errors.h b/src/errors.h
index d30b4b0..7059b28 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -3203,4 +3203,8 @@
 	INIT(= N_("E1261: Cannot import .vim without using \"as\""));
 EXTERN char e_cannot_import_same_script_twice_str[]
 	INIT(= N_("E1262: Cannot import the same script twice: %s"));
+EXTERN char e_using_autoload_in_script_not_under_autoload_directory[]
+	INIT(= N_("E1263: Using autoload in a script not under an autoload directory"));
+EXTERN char e_autoload_import_cannot_use_absolute_or_relative_path[]
+	INIT(= N_("E1264: Autoload import cannot use absolute or relative path: %s"));
 #endif