Symbol versions for inlined symbols

[dank@kegel.com]

> You may wish to read the proceedings from this year's GCC summit, where
> another solution was presented by some gentlemen from Intel.  For
> various reasons, symbol versioning is not a useful solution to this
> problem.
>
> No one objected to their solution in principle, AFAICT, although there
> was some discussion afterwards about whether the use of strong
> namespace using was really necessary

FWIW, I tried to capture some of the discussion at
http://kegel.com/gcc/diary.txt