Remove unused parameters from test code.

test/same-source-file-name/src/prog3.c

 // Copyright (c) 2012 Google Inc. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdio.h>
 
 extern void func(void);
 extern void subdir1_func(void);
 extern void subdir2_func(void);
 
-int main(int argc, char *argv[])
+int main()
 {
   printf("Hello from prog3.c\n");
   func();
   subdir1_func();
   subdir2_func();
   return 0;
 }