Latest 21.4.19 windows native setup kit uploaded

[Per Mildner SICS Usenet]

> Further investigation showed that 21.4.13 added a registry item called
> Path to the registry which added the directory to the path for XEmacs
> shells only (not the global system path).  Version 21.4.18 does not add
> this registry item.

There should not even be necessary to have any paths in the registry, 
xemacs.exe should figure out where it is located and use that to find the 
location of any related files and folders. It could then set its environment 
variable PATH so that any sub-shells/sub-processes can find the xemacs tools 
from their inherited value of PATH.