Added test for variadic arguments

tests/builtin.qc

@@ -1,4 +1,4 @@
-void(...) print = #1;
+void(string) print = #1;
 
 void() main = {
     print("hello world");

tests/variadic.qc

@@ -0,0 +1,5 @@
+void(...) print = #1;
+
+void() main = {
+    print("hello", " world");
+}

tests/variadic.tmpl

@@ -0,0 +1,8 @@
+I: variadic.qc
+D: test variadic arguments
+T: -execute
+C: -std=gmqcc
+E: $null
+F: variadic arguments failed
+S: variadic arguments worked
+M: hello world