Pass CMAKE_BUILD_TYPE into the test on generators that use it so that
the per-config part of the test can activate as needed. Do not make the
per-config part conditional on the Debug configuration because the
generator expressions evaluate to empty in other configurations.
Skip the per-config source case with the Ninja generator because it does
not currently work. cmQtAutoGenerators::InitializeAutogenTarget needs
to know the list of source files on a target, but generator expressions
in the list cannot be evaluated until after CreateGeneratorTargets has
been called. That cannot happen until after Autogen targets have been
generated. It is a chicken-and-egg problem.
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