The virtgpu_kumquat deps -- used by gfxstream -- don't work
with cross-compile. This is because they set "native: true" even
for host machine deps.
In addition, some proc-macro deps (which need "native: true") try
to link against host machine deps.
Reviewed-by: David Gilhooley <djgilhooley.gmail.com>
d60c19fd10