Fix check_glob.c

On ARM, the missing return 0 at end causes the program to return 16.
I believe that this is an error relative to the standard, but
in any case, it's worth fixing.

config/check_glob.c

@@ -11,4 +11,5 @@ int main()
     const char *pattern = "*";
     glob(pattern, GLOB_MARK, glob_error, &files);
     globfree(&files);
+    return 0;
 }