[Bug driver/111084] Support configurable dynamic linker path

[xry111 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111084

--- Comment #6 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #5)
> Also buildroot uses sysroots and chroot/containers instead.
> 
> Containers/chroot is the better approach anyways.

We use sysroot and chroot since Linux From Scratch 10.0 (released Sept 2020).