I have done further testing on the build failure of mariadb.

Trying to build other packages that depend on mariadb for x86_64 and
i686 result in different failures for the build of mariadb.

`guix describe` outputs:

```
Generation 24   May 12 2021 18:06:24    (current)
  guix d6aeebb
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: d6aeebb23639258311fdfb9dbf5f903079fde51a
```

The build output for each of the following is attached.

* x86_64 youtube-dl
** Failing test(s): perfschema.socket_connect
* x86_64 mpv
** Failing test(s): perfschema.transaction_nested_events
* x86_64 jami-gnome
** Failing test(s): perfschema.socket_connect
* x86_64 qtox
** Failing test(s): perfschema.socket_connect
* x86_64 qutebrowser
** Failing test(s): perfschema.table_aggregate_hist_4u_2t

* i686 youtube-dl
** Failing test(s): perfschema.socket_connect
* i686 mpv
** Failing test(s): perfschema.table_aggregate_hist_4u_3t
* i686 jami-gnome
** Failing test(s): perfschema.mdl_func
* i686 qtox
** Failing test(s): perfschema.socket_connect
* i686 qutebrowser
** Failing test(s): perfschema.socket_connect

I am building the i686 packages with this command `guix build
--no-substitutes --system=i686-linux <package>`.