Update to HPy 46f151a

Merged Antonio Cuni requested to merge branch/hpy into branch/py3.6

This MR updates _hpy_universal to hpyproject/hpy rev 7cf3e2f.

Reviews are welcome; cc @rlamy @arigo @mattip @hodgestar

EDIT: I pushed some more commits, so now the target hpy version is 46f151a

Edited by Antonio Cuni

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