automake: do not provide .tar.xz for now.
automake: do not provide .tar.xz for now.

xz not available by default on OS X.

0-wiz-0/miller,olorin/miller,0-wiz-0/miller,0-wiz-0/miller,0-wiz-0/miller,olorin/miller,0-wiz-0/miller,olorin/miller,olorin/miller,0-wiz-0/miller,0-wiz-0/miller,olorin/miller,0-wiz-0/miller,olorin/miller,olorin/miller,olorin/miller