test-duplicateoptions.py without inotify

[Mads Kiilerich]

The inotify extension is only available on few platforms. That causes 
test-duplicateoptions.py to fail on platforms such as Solaris:
*** failed to import extension inotify: No module named inotify

The failure can be simulated on linux with
make local
rm ./hgext/inotify/linux/_inotify.so
cd tests
./run-tests.py  -li test-duplicateoptions.py

Idan, will you fix it somehow?

/Mads