Fix bsd-user build after d915b7bb

Must include "qemu-version.h" for the QEMU_PKGVERSION definition.

Signed-off-by: Ed Maste <emaste@freebsd.org>
Message-id: 1471877833-52343-1-git-send-email-emaste@freebsd.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>