bug#31814: setuid programs are not first in PATH

[Clément Lassieur]

Hi,

sourcing /etc/profile

- prepends /run/setuid-programs to $PATH
- then sources $HOME/.guix-profile/etc/profile

and sourcing $HOME/.guix-profile/etc/profile

- prepends $HOME/.guix-profile/bin to $PATH
- prepends $HOME/.guix-profile/sbin to $PATH

so in the end, $PATH looks like:

~/.config/guix/current/bin:~/.guix-profile/bin:~/.guix-profile/sbin:/run/setuid-programs:...

and a command like 'ping' is found in ~/.guix-profile/bin, which makes
it unusable.

Clément