FreeBSD_HEAD_i386 - Build #2216 - Fixed

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FreeBSD_HEAD_i386 - Build #2216 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2216/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2216/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2216/console

Change summaries:

294887 by glebius:
Fix build on i386. I can't yet understand why does it build on amd64.

294886 by sephe:
hyperv/vmbus: Event handling code refactor.

- Use taskqueue instead of swi for event handling.
- Scan the interrupt flags in filter
- Disable ringbuffer interrupt mask in filter to ensure no unnecessary
  interrupts.

Submitted by:		Jun Su <junsu microsoft com>
Reviewed by:		adrian, sephe, Dexuan <decui microsoft com>
Approved by:		adrian (mentor)
MFC after:		2 weeks
Sponsored by:		Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D4920

294885 by jhibbits:
Fix the build post-r294883.

Pointy-hat to:	jhibbits
X-MFC with:	r294883