Rename the extern declaration of `tccd' and `ioasiccd' in src/sys/dev/tc/{tvar.h,ioasicvar.h", respectively, to be `tc_cd' and `ioasic_cd', to match the 1.1B-style definitions.
found in many DECstations and all of the TC-bus Alphas. This is provided so that the machine-independent TC if_le driver will be able to use it.