patch 8.2.2378: Vim9: no error message for dividing by zero

Problem:    Vim9: no error message for dividing by zero.
Solution:   Give an error message. (issue #7704)
diff --git a/src/errors.h b/src/errors.h
index eb5ee1d..4bd4efe 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -343,3 +343,5 @@
 	INIT(= N_("E1152: Mismatched enddef"));
 EXTERN char e_invalid_operation_for_bool[]
 	INIT(= N_("E1153: Invalid operation for bool"));
+EXTERN char e_divide_by_zero[]
+	INIT(= N_("E1154: Divide by zero"));