Correct day of week for old test dates

We upgraded timelib in HHVM master, and these tests started failing. I think the test data is bad - new data agrees with date -d $TEST_DATA, and wolfram alpha (which also correlates it with the emporer's death).

http://www.wolframalpha.com/input/?i=what+day+was+117-08-09
http://www.wolframalpha.com/input/?i=01+Jan+0101

Travis will fail this test as it's running 2.4.0, not master.