gnome-shell crashes due to segmentation fault due to setenv after starting threads
Note: I have no indication that this issue only affects the test suite.
```
Nis 09 20:58:22 amnesia gnome-shell[8965]: Using Wayland display name 'wayland-0'
Nis 09 20:58:22 amnesia kernel: traps: [pango] FcInit[8999] general protection fault ip:7d28ccc6514d sp:7d28a17ee5d0 error:0 in libc.so.6[7d28ccc4c000+155000]
Nis 09 20:58:22 amnesia systemd[6026]: org.gnome.Shell@wayland.service: Main process exited, code=killed, status=11/SEGV
Nis 09 20:58:22 amnesia systemd[6026]: org.gnome.Shell@wayland.service: Failed with result 'signal'.
Nis 09 20:58:22 amnesia systemd[6026]: Failed to start org.gnome.Shell@wayland.service - GNOME Shell on Wayland.
```
Failing test runs:
* https://jenkins.tails.boum.org/job/test_Tails_ISO_20328-fix-tps-frontend-error-message/1//cucumber-html-reports/report-feature_20_1315884850.html ([screenshot](/uploads/2abc562b343d1c54a19ea1e51c3b3012/02_30_21_Tails_is_localized_for_every_tier-1_language__Examples___11_.png), [video](/uploads/2a6c91623ae4c4bc7baf5ceeb6dd06be/02_30_21_Tails_is_localized_for_every_tier-1_language__Examples___11_.mkv), [journal](/uploads/76534a2da2756dba991b8d84304f6a1c/02_30_21_Tails_is_localized_for_every_tier-1_language__Examples___11_.journal))
issue