Removing Phobos dependencies from dmd test suite

[Seb]

On Friday, 19 April 2019 at 21:05:23 UTC, Vladimir Panteleev 
wrote:
> On Wednesday, 17 April 2019 at 09:47:58 UTC, Walter Bright 
> wrote:
>> For a more challenging fix,
>>
>>   test/runnable/test_cdcmp.d
>
> Rewriting that to not use Phobos looks like a complete waste of 
> time.

Yes, especially because it doesn't use Phobos at all when run 
through the testsuite ;-)