[phobos] Windows unit tests shouldn't be in one folder

[Walter Bright]

The windows build does not do a separate file for each unittest, it does them 
all at once. So there should be no conflict.

On 1/19/2012 10:49 PM, Jonathan M Davis wrote:
> The unit tests on Linux maintain the module hierarchy when they're compiled.
> For example, on 64-bit Linux, std.net.isemail's unit test object file and
> binary go in generated/linux/debug/64/unittest/std/net/. However, on Windows,
> they all go in the unittest folder.
>