Yeah so now we can build wheels for aarch64 (that is for Raspberry PI and android devices).

But since it uses emulation it basically takes forever to build them (45 minutes instead of 10).

The wheels are built only on master and when forced in PR with 'build wheels' in the commit message so it should not be seen during PR but it will inrease the chance that the wheels build will fail on master branch (I kind of hat those red X).

WDYT @ncourty @agramfort ?