NetBSD base gcc & libatomic

[Riccardo Mottola <riccardo.mottola%libero.it@localhost>]

Hi,

on x86-32, I noticed our compiler emits calls to atomic functions, but
does not ship libatomic, which is available only as an "addon" in pkgsrc.
I think the base compiler should be consistent and either ship libraries
it uses or do not use.
Gcc from pkgsrc then is free to pull libatomic in instead.

What do you think?

Riccardo