Avoid a potential testing race condition in lib/Dirhandle.ttest.

Dirhandle.t does a glob and a readdir.
It then compares (some) filenames.

When testing in parallel this is a race condition.

Attached patch removes the race condition by going to 'uni'.

• Avoid a potential testing race condition in lib/Dirhandle.ttest. by Bram
• Re: Avoid a potential testing race condition in lib/Dirhandle.ttest. by Nicholas Clark