FreeBSD_STABLE_10-i386 - Build #1520 - Fixed

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FreeBSD_STABLE_10-i386 - Build #1520 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_STABLE_10-i386/1520/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_STABLE_10-i386/1520/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_STABLE_10-i386/1520/console

Change summaries:

309530 by kib:
MFC r309209:
Do not enable nullfs vnode caching over nfs v4 mounts.

309529 by kib:
Add sys/systm.h to have critical_enter() defined, required by
machine/counter.h on i386.

This is a direct commit to stable/10.

Sponsored by:	The FreeBSD Foundation