CMake `CMAKE_COMPILE_WARNING_AS_ERROR`

[ptheywood]

CMake 3.24 intorduced CMAKE_COMPILE_WARNING_AS_ERROR, with support for compilers we currently support (and others).

This could be used to replace FLAMEGPU_WARNINGS_AS_ERRORS, preferring the cmake versions of variables (we could either deprecate the current version or just remove it).

https://cmake.org/cmake/help/v3.24/variable/CMAKE_COMPILE_WARNING_AS_ERROR.html#variable:CMAKE_COMPILE_WARNING_AS_ERROR

[ptheywood]

CMake 4.0 introduces a matching CMAKE_LINK_WARNING_AS_ERROR, so we cannot fully replace the usage of FLAMEGPU_WARNINGS_AS_ERRORS for CMake > 3.25.2 with CMake defaults.

Also unclear if this will apply to device linking or just host linking (NVIDIA/CUDA is not explicitly mentioned in the list of implemented linkers). Probably simplest to just cause a device link warning and see if it is promoted to an error rather than dig through CMake.