Build failed in Jenkins: FreeBSD_HEAD-modules #394

See <https://jenkins.freebsd.org/jenkins/job/FreeBSD_HEAD-modules/394/changes>

Changes:

[nwhitehorn] Make ofwfb actually work again. Apparently the API it was written against
still exists but is now silently ignored by the VT core. At least xboxfb
needs similar changes.

[ian] Make the hardware memory and instruction barrier functions work on armv4
and armv5 as well.

------------------------------------------
Started by upstream project "FreeBSD_HEAD" build number 644
originally caused by:
 Started by an SCM change
Building remotely on jenkins-10.freebsd.org (FreeBSD-10) in workspace <https://jenkins.freebsd.org/jenkins/job/FreeBSD_HEAD-modules/ws/>
Updating svn://svn.freebsd.org/base/head/sys at revision '2014-05-11T01:40:35.529 +0000'
U         modules/Makefile
U         dev/vt/hw/ofwfb/ofwfb.c
U         arm/include/atomic.h
At revision 265862
Updating svn://svn.freebsd.org/base/head/share/mk at revision '2014-05-11T01:40:35.529 +0000'
At revision 265862
no change for svn://svn.freebsd.org/base/head/share/mk since the previous build
[FreeBSD_HEAD-modules] $ /bin/sh -xe /tmp/hudson6157057872793104615.sh
+ export JFLAG=-j4
+ export MAKESYSPATH=<https://jenkins.freebsd.org/jenkins/job/FreeBSD_HEAD-modules/ws/mk>
+ cd <https://jenkins.freebsd.org/jenkins/job/FreeBSD_HEAD-modules/ws/sys/modules>
+ echo '=== make cleandir ==='
=== make cleandir ===
+ make cleandir
===> aac (cleandir)
make[1]: "<https://jenkins.freebsd.org/jenkins/job/FreeBSD_HEAD-modules/ws/sys/modules/aac/../../conf/kern.opts.mk"> line 24: Could not find ../../share/mk/bsd.mkopt.mk
make[1]: "<https://jenkins.freebsd.org/jenkins/job/FreeBSD_HEAD-modules/ws/sys/modules/aac/../../conf/kern.mk"> line 38: Malformed conditional (${MK_FORMAT_EXTENSIONS} == "no")
make[1]: Fatal errors encountered -- cannot continue
make[1]: stopped in <https://jenkins.freebsd.org/jenkins/job/FreeBSD_HEAD-modules/ws/sys/modules/aac>
*** Error code 1

Stop.
make: stopped in <https://jenkins.freebsd.org/jenkins/job/FreeBSD_HEAD-modules/ws/sys/modules>
Build step 'Execute shell' marked build as failure