autogen: cmake 3.20.0 race in cmake_autogen

After cmake 3.20 building Qt6 on MinGW-w64 starts to fail (with both Ninja and Makefiles). I have observed that cmake generate ".d" file during build with Ninja. I tried to set CMP0116 to "OLD" but It has no effect. Is there a way to disable that and restore the old behavior (not generating these files).

Edited May 03, 2021 by Brad King

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