depmod doesn't seem to be happy about our paths...
```
# depmod
depmod: ERROR: could not open directory /lib/modules/5.10.2-gnu: No such
file or directory
depmod: FATAL: could not search modules: No such file or directory
```
Happens on up to date master branch:
```
$ guix system describe
Generation 129 Dec 26 2020 11:13:28 (current)
file name: /var/guix/profiles/system-129-link
canonical file name: /gnu/store/yb73df860bd39hzrbvhz79ydqyqfbbdh-system
label: GNU with Linux-Libre 5.10.2
bootloader: grub
root device: UUID: d5e47476-ccdb-4dd5-8f69-f670d5ab25a0
kernel:
/gnu/store/si6ly6im9ih9fpycp5zq1895y2jl4kzm-linux-libre-5.10.2/bzImage
channels:
guix:
repository URL: https://git.savannah.gnu.org/git/guix.git
branch: master
commit: 7be871bb69b8df20e566aa3d078b8cbe453693e2
configuration file:
/gnu/store/gy14nza51q9s8fyhd53caaf0bvv3363w-configuration.scm
```
