[cmake] partly revert #15642 to have wayland and GBM working #15804
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Description
With the include of Platform.cmake to have for addons is the GBM_RENDER_SYSTEM not defined, this becomes set from "./tools/depends/target/Toolchain.cmake" but on a other place.
This remove the change, but after the release must be the cmake workflow cleaned up. There are some hen and egg problems and maybe some hidden faults where a value becomes checked which never available.
Motivation and Context
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