CMake's autogen triggers warning for CMP0116
With a trivial Qt project that uses AUTOMOC in a subdirectory, the policy warning for CMP0116 gets triggered by the autogen code. After inserting a bit of debugging output (because the policy warning doesn't tell you what target or dependency triggers the warning), it is being triggered when the depfile is <targetName>_autogen/deps and the customStep will be timestamp-<someHash> (depfile and customStep refer to variables in cmLocalNinjaGenerator.cxx around here).
CMake's autogen should be able to construct the Ninja dependencies without triggering CMP0116.
Cc: @kyle.edwards
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