Testsuite: Add no-test to copyFiles test
Testsuite: Add no-test to copyFiles test

This test is only supposed to be run, not unittested.
It can create a problem when one wants to re-run the test suite,
as if the unittest have been built, there's an extra file in the bin directory,
which in turns makes the test fail.

rjframe/dub,D-Programming-Language/dub,Geod24/dub