crecord: don't abort on Windows when curses isn't available
This is the hack portion of the previous patch, which can be backed out once we
figure out how to deal with curses. Without this, the tests affected by the
import problem mentioned in the previous patch fail in exactly the same way, but
with the nicer 'module not available' error.
try:
import coverage
getattr(coverage, 'process_startup', lambda: None)()
except ImportError:
pass