Duplicate tests that are run twice as both C and C++ tests to fix parallel make: li_cdata

Examples/test-suite/go/li_cdata_cpp_runme.go

@@ -0,0 +1,13 @@
+package main
+
+import . "./li_cdata_cpp"
+
+func main() {
+	s := "ABC abc"
+	m := Malloc(256)
+	Memmove(m, s, len(s))
+	ss := Cdata(m, 7)
+	if string(ss) != "ABC abc" {
+		panic("failed")
+	}
+}