ZXID: Fixed warning about redefined symbol.

GETTIMEOFDAY is defined in both port.h and <zxid/errmac.h>.
We don't use either in the ZXID module, so just undef the
first definition.
A token following a dot is not a variable.
Tools.Standalone.precompile: Added some values for INHERITs.

The inherit number (suffix _inh_num) and inherit identifier offset
(suffix _inh_offset) are now provided for INHERITs.