CrossgenLayout is missing Inputs & Outputs which causes it to run in a no-op incremental build

[ViktorHofer]

This is from a no-op incremental build (build.cmd && build.cmd -bl):

The CrossgenLayout target is missing inputs & outputs and is causing a full no-op build to take ~2 minutes. This could get fixed by declaring inputs and outputs:

sdk/src/Installer/redist-installer/targets/Crossgen.targets

Line 4 in e21098f

<Target Name="CrossgenLayout"

cc @baronfel @SimaTian @marcpopMSFT