With the help of the community, I'm currently resurrecting the original X11 feed that was on svn before, but has no longer been available through the previous svn url that has been in the default feeds.conf.

I have uploaded the repo to my github here: https://github.com/mkschreder/openwrt-xorg-feed

I'm accepting patches and pull requests. Feel free to test, build, copy and update this feed with latest Xorg packages.