[phobos] unit test hangs

[Brad Roberts]

Between r2086 and 2089 the phobos tests on win32 only have started hanging.

Last good:
    http://d.puremagic.com/test-results/test.ghtml?runid=1374

First bad:
    http://d.puremagic.com/test-results/test.ghtml?runid=1376