Extend aligned_membuf<> usage

[Jonathan Wakely]

On 01/02/18 22:48 +0100, François Dumont wrote:
>Hi
>
>Â Â Â  As we just bump version namespace it might be interesting to do 
>the following change now. What do you think ?

I'd rather not make the code harder to read in all those places just
for an optional mode that nobody uses.

Wouldn't it make more sense to simply make __aligned_buffer identical
to __aligned_membuf for the versioned-namespace? Then at least the
conditional code is only in one place.