draft release notes for gcc 3.3

[Benjamin Kosnik]

>OK, let's make sure that I can explain all the issues correctly.  As far
>as the compiler is concerned, we have ABI compatibility.  For the library,
>we've made many changes, but use versioning so that programs linked against

                                                           ^dynamically linked

>3.2.x's libstdc++ will continue to work.  But this only works on OSes that
>implement versioning, correct?  

Yes.

-benjamin