CMake 3.5.1 fixes for MTX Downloads and Use CMake 3.5.1 in github CI jobs #2772
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Avoid new options from mtx downloads external project
Change github ci to xenial image for cmake 3.5.1
xenial however won't build/test CPU backend using ATLAS. There is a known issue with atlas+lapacke on Ubuntu 16.04 as lapacke is broken. OSX runner uses whatever cmake version the image provides.