Remove last bit of RTDM

Signed-off-by: Alec Ari <neotheuser@ymail.com>
Remove dead code in xn.h

Signed-off-by: Alec Ari <neotheuser@ymail.com>
Remove bits and tbx

Not needed for LinuxCNC

Signed-off-by: Alec Ari <neotheuser@ymail.com>