Code review comment for lp:~kdub/mir/fix-1607358

1) alright by me.
2) Sounds like that could be a problem with the cross-compile-chroot.sh script (we should probably find a more standardized way to crossbuild for development by now). The problem that vivid doesn't have the eglstream extensions though still is a problem for the package builders that I don't know how to resolve, short of backports to our mesa package.

Also, a +1 vote from the automatic CI runs on this MP is not a 'real' +1 vote, as CI goes and changes the the platforms built. The second job Alexandros set up has to +1 the MP before its fixed.