We need to modify spirv-tools existing CMakeLists.txt to make
sure that its binaries and libs are not included in the filament
installed output.
This change was present before, but overwritten when spirv-tools
updated (wrt the WebGPU project).
In addition to modifying the CMakeLists.txt, we add a script to
carry out the changes automatically when running the update script
in the future.
Fixes#9168
49b8a17b1f