[tlbuild] Testing cxx-runtime-hack -- V 1.1

[Karl Berry]

    Just using <iostream> ought to be OK. 

I agree.  Because, as you and I both find in grepping the source tree,
we are unconditionally using it in various places places already.
So we can forget <iostream.h>, as far as I can tell.

Yesterday I changed the runtime_hack macro in web2c/configure.in to use
 	#include <iostream>
 	using namespace std;

I know it'll change again (more significantly) when we integrate your
work, but I didn't want to forget about it in the meantime.