caused by bkaradzic/bgfx.cmake#22
overriding *any* renderer config defines causes bgfx to disable
automatic config derivation for *all* renderers - this meant that force
disabling WebGPU was also implicitly disabling all other renderers by
default. not sure what the best option is here (outside of explicitly
setting all renderers in the build system) but removing this for now to
restore expected per-platform defaults.
26dbcda964