compiler: do not exit early, when given -o x.c or -o x.js

cmd/v/v.v

@@ -28,6 +28,10 @@ const (
 )
 
 fn main() {
+	main_v()
+}
+
+fn main_v() {
 	args := os.args[1..]
 	// args = 123
 	if args.len == 0 || args[0] in ['-', 'repl'] {