This switches:

  BUILD_COPY_HEADERS / LOCAL_COPY_HEADERS
  BUILD_HOST_EXECUTABLE
  BUILD_HOST_SHARED_LIBRARY
  BUILD_HOST_STATIC_LIBRARY

to errors by default. Devices can set
BUILD_BROKEN_USES_BUILD_HOST_EXECUTABLE (etc) to turn these errors back
to warnings. I've done that for all of our internal devices.

Bug: 130719878
Bug: 130696912
Bug: 130722971
Bug: 130723227
Test: remove the BUILD_BROKEN_USES_* lines from a device, see errors
Change-Id: I1aecf97f64e281df3682ff0a0fb3ac4283790acd