Add host symlinks for `/var/log/wtmp` and `/var/run`

This should fix the issues with w and who described in https://gitlab.com/eessi/support/-/issues/32, and also the last command.

Without these symlinks:

$ source /cvmfs/pilot.eessi-hpc.org/versions/2023.06/init/bash 

[EESSI pilot 2023.06] $ w
 14:16:24 up 3 days, 23:32,  0 users,  load average: 0.00, 0.00, 0.00
USER     TTY        LOGIN@   IDLE   JCPU   PCPU WHAT
[EESSI pilot 2023.06] $ who
[EESSI pilot 2023.06] $ last
last: cannot open /cvmfs/pilot.eessi-hpc.org/versions/2023.06/compat/linux/x86_64/var/log/wtmp: No such file or directory

With the host symlinks in place (tested in a non-published transaction on the pilot Stratum 0):

[EESSI pilot 2023.06] $ w
 14:17:34 up 3 days, 23:33,  2 users,  load average: 0.00, 0.00, 0.00
USER     TTY        LOGIN@   IDLE   JCPU   PCPU WHAT
bob      pts/0     14:12    1.00s  0.04s  0.00s w
bob      pts/1     14:14    6.00s  0.07s  0.07s -bash
[EESSI pilot 2023.06] $ who
bob      pts/0        2024-01-19 14:12 (<REMOVED ACTUAL IP ADDRESS>)
bob      pts/1        2024-01-19 14:14 (<REMOVED ACTUAL IP ADDRESS>)
[EESSI pilot 2023.06] $ last
bob      pts/1        <REMOVED ACTUAL IP ADDRESS>    Fri Jan 19 14:14   still logged in
bob      pts/0        <REMOVED ACTUAL IP ADDRESS>    Fri Jan 19 14:12   still logged in
bob      pts/1        <REMOVED ACTUAL IP ADDRESS>   Thu Jan 18 16:39 - 18:58  (02:18)
bob      pts/0        <REMOVED ACTUAL IP ADDRESS>   Thu Jan 18 16:37 - 18:58  (02:20)
bob      pts/0        <REMOVED ACTUAL IP ADDRESS>    Mon Jan 15 14:45 - 15:50  (01:05)
reboot   system boot  4.15.0-213-gener Mon Jan 15 14:44   still running
bob      pts/0        <REMOVED ACTUAL IP ADDRESS>    Mon Jan 15 14:34 - 14:43  (00:09)
bob      pts/0        <REMOVED ACTUAL IP ADDRESS>    Tue Jan  2 19:24 - 19:33  (00:09)

wtmp begins Tue Jan  2 19:24:50 2024

Instance eessi-bot-mc-aws is configured to build:

arch x86_64/generic for repo eessi-hpc.org-2023.06-compat
arch x86_64/generic for repo eessi-hpc.org-2023.06-software
arch x86_64/generic for repo eessi.io-2023.06-compat
arch x86_64/generic for repo eessi.io-2023.06-software
arch x86_64/intel/haswell for repo eessi-hpc.org-2023.06-compat
arch x86_64/intel/haswell for repo eessi-hpc.org-2023.06-software
arch x86_64/intel/haswell for repo eessi.io-2023.06-compat
arch x86_64/intel/haswell for repo eessi.io-2023.06-software
arch x86_64/intel/skylake_avx512 for repo eessi-hpc.org-2023.06-compat
arch x86_64/intel/skylake_avx512 for repo eessi-hpc.org-2023.06-software
arch x86_64/intel/skylake_avx512 for repo eessi.io-2023.06-compat
arch x86_64/intel/skylake_avx512 for repo eessi.io-2023.06-software
arch x86_64/amd/zen2 for repo eessi-hpc.org-2023.06-compat
arch x86_64/amd/zen2 for repo eessi-hpc.org-2023.06-software
arch x86_64/amd/zen2 for repo eessi.io-2023.06-compat
arch x86_64/amd/zen2 for repo eessi.io-2023.06-software
arch x86_64/amd/zen3 for repo eessi-hpc.org-2023.06-compat
arch x86_64/amd/zen3 for repo eessi-hpc.org-2023.06-software
arch x86_64/amd/zen3 for repo eessi.io-2023.06-compat
arch x86_64/amd/zen3 for repo eessi.io-2023.06-software
arch aarch64/generic for repo eessi-hpc.org-2023.06-compat
arch aarch64/generic for repo eessi-hpc.org-2023.06-software
arch aarch64/generic for repo eessi.io-2023.06-compat
arch aarch64/generic for repo eessi.io-2023.06-software
arch aarch64/neoverse_n1 for repo eessi-hpc.org-2023.06-compat
arch aarch64/neoverse_n1 for repo eessi-hpc.org-2023.06-software
arch aarch64/neoverse_n1 for repo eessi.io-2023.06-compat
arch aarch64/neoverse_n1 for repo eessi.io-2023.06-software
arch aarch64/neoverse_v1 for repo eessi-hpc.org-2023.06-compat
arch aarch64/neoverse_v1 for repo eessi-hpc.org-2023.06-software
arch aarch64/neoverse_v1 for repo eessi.io-2023.06-compat
arch aarch64/neoverse_v1 for repo eessi.io-2023.06-software

EESSI / compatibility-layer

Add host symlinks for `/var/log/wtmp` and `/var/run` #194