some modules needed for x11-wm/i3 test phases

On the overlay, this flag gets ignored (https://github.com/gentoo-perl/perl-experimental/blob/master/eclass/perl-module.eclass#L240) and you should use `RESTRICT="test"` instead.

Alternatively, if you can isolate the test/subset of tests that is broken/undesirable, 

```bash
PERL_RM_FILES=(
   "t/somepath.t"
)
```

Will get them pruned.