G++ test failures

[Benjamin Kosnik]

> It seems like from what you say, though, that everything is OK: the
> test-cases now work independent of whether or not strstream.h is in
> std, and you'll want a backwards-compatibility header called
> strstream.h anyhow, right?

test-cases working independently of std:: is nice

Implementations differ on what to do with strstream. It seems like the 
most sensible approach would be to have <strstream> as indicated in the 
standard, and construct a strstream.h header file that uses "using std::foo"
declarations to put the required names into the global namespace.

Pending further discussion, this is what I intend to do.

-benjamin