installworld of r311444 fails

[Kurt Lidl]

Today's build of -head (r3111444) fails to install
on my sparc64 (upgrading from stable/10, which was
just updated yesterday).

The kernel installation and reboot worked fine.
The installation of the user bits failed:

===> usr.bin/bsdcat/tests (install)
install  -o root  -g wheel -m 555  functional_test 
/usr/tests/usr.bin/bsdcat/functional_test
install: /usr/tests/usr.bin/bsdcat/functional_test: No such file or 
directory
*** Error code 71

Stop.
bmake[6]: stopped in /usr/src/usr.bin/bsdcat/tests
*** Error code 1

Looks like the target directory creation was forgotten.

FWIW, there is no /etc/src.conf on the machine, so it's a completely
stock build.

-Kurt