repl: reproduce the void print function error (#13372)

vlib/v/tests/repl/fn_calls.repl

@@ -0,0 +1,10 @@
+math.sinf(50.0)
+println(1+math.sinf(50.0))
+fn test() { println('foo') } fn test2(a int) { println(a) }
+test()
+test2(123)
+===output===
+-0.2623749
+0.7376251
+foo
+123

vlib/v/tests/repl/void_vlib_fncall.repl

@@ -0,0 +1,3 @@
+os.write_file('hi','hi')?
+os.rm('hi')?
+===output===