ci: fix failing -Werror job with tcc

cmd/tools/vtest-self.v

@@ -33,7 +33,7 @@ const (
 	]
 	skip_with_fsanitize_undefined = []string{}
 	skip_with_werror              = [
-		'vlib/builtin/array_test.v',
+		'vlib/sync/array_rlock_test.v',
 		'vlib/clipboard/clipboard_test.v',
 		'vlib/dl/dl_test.v',
 		'vlib/dl/example/use_test.v',

vlib/builtin/array_test.v

@@ -1064,8 +1064,10 @@ fn test_array_int_pop() {
 	z := a.pop()
 	assert a.len == 3
 	assert z == 4
-	a.pop()
-	a.pop()
+	x1 := a.pop()
+	x2 := a.pop()
+	dump(x1)
+	dump(x2)
 	final := a.pop()
 	assert final == 1
 }