BUG: Fix signature of main to work on both strict ANSI and non-ANSI C compilers.

Modules/CheckIncludeFile.c.in

@@ -1,6 +1,13 @@
 #include <${CHECK_INCLUDE_FILE_VAR}>
 
+#ifdef __CLASSIC_C__
 int main()
 {
   return 0;
 }
+#else
+int main(void)
+{
+  return 0;
+}
+#endif