show an info message if a C compiler is not installed

examples/x64/hello_world.v

@@ -1,11 +1,14 @@
+fn test_fn() {
+	println('test fn')
+}	
+
 fn main() {
 	println('x64 test')
 	for _ in 0..5 {
 		println('Hello world from V x64 machine code generator!')
 	}
 	println('Hello again!')
+	test_fn()
+	println('dne')
 }
 
-fn test_fn() {
-	println('test fn')
-}