[Patch] Sylvain's fix for libstdc++/10783

[Benjamin Kosnik]

> int main() 
> { 
>   test01();
>   test02();
>+  test03();
>   return 0;
> }

I propose a ban on all appending to test files. We've got to move over
to the single-test-single-file form eventually, might as well do it as
cases are added.

Thus

reverse_iterator/1.cc
reverse_iterator/2.cc
reverse_iterator/3.cc

-benjamin