move out c/cpp/py

cl/_testdata/vargs/in.go

@@ -0,0 +1,13 @@
+package main
+
+import "github.com/goplus/lib/c"
+
+func test(a ...any) {
+	for _, v := range a {
+		c.Printf(c.Str("%d\n"), v.(int))
+	}
+}
+
+func main() {
+	test(1, 2, 3)
+}