Update to xemacs Portfile

[John Ridgway]

Friends -
I have made a few changes to the xemacs Portfile, and I have attached  
the modified Portfile.  Should I install this, and if so could  
someone point me to directions on how to do that?  Alternatively,  
would someone else do this?  The modifications are to install xemacs  
21.4.19 rather than 21.4.17, and the addition of a mule variant, that  
works properly with the sumo variant (I believe).

Peace
- John

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