Some Windows functions have erroneous syntax errors.

There are a few Windows Function tests in our nightly tests that are now showing as syntax errors when they did not in previous versions.

A good example is queries/working_tpch1_compareLogOnly/windowFunctions/q0024.sql:
SELECT last_value(four) OVER (ORDER BY ten, four), ten, four FROM tenk1 WHERE unique2 < 10;