Log Message:
haxm: Update to 0.20190301.7cb307c4e7ff066b51a503c76f72d7dfefc78760

Drop local patches as merged.

Compat breaking change
======================
Changed major numbers used on NetBSD.
The device nodes must be regenerated.

Upstream changelog
==================
- Improve support of NetBSD as host.
- Changes improving emulation of niche guests.