Remove obsolete comment from DosGlob.pm

Remove obsolete comment from DosGlob.pm

This comment was added by commit 37248846, without explanation.

DosGlob.pm already had ‘use strict’ three days before that, added in
commit b75c8c73, three days earlier.

I can only assume that 37248846 was written before b75c8c73 was
applied, and that simply adding ‘use strict’ didn’t work, considering
that b75c8c73 changed quite a few things to make things strict-safe.