wrap the failing call_checker test in an eval and TODO it

this allows the rest of the test script to run, and will help make other
cygwin test issues more obvious once the other failures are fixed or
worked-around
use a different name for the test directory

on Windows (cygwin) I was getting rare failures creating $copy1 with
an error complaining that it was a directory, possibly due to some
background process tracking directories.
these permissions appear to be handled correctly in current cygwin

this TODO has been passing on my smoke testers for years, if it turns
out it isn't passing for someone, it should probably be skipped
instead of TODOed to prevent the noise.