Remove log from git repo

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Add proper build tests with world support

In particular, the previous approaches I was trying to employ
were too invasive and complicated. This approach is considerably
simpler as all that needs to be done is -DWITH_TESTS needs to
be passed into make hier/make everything/make installworld.

Also, express the lib/atf dependency better in prebuild-libs to
avoid potential build races

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Add ${TESTSDIR} so things install properly according to bsd.test.mk

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Merge branch 'master' of github.com:/yaneurabeya/freebsd