make - Fix intermittent build failure
make - Fix intermittent build failure

Was getting a "Directory not empty" error when removing a dir.  Hasn't been
tested that it fixes the issue as it only occurs intermittently.

scottsilverlabs/raspberrystem-projects,scottsilverlabs/raspberrystem-projects,scottsilverlabs/raspberrystem-projects,scottsilverlabs/raspberrystem-projects