obscache: do not check of argument count of wrapped function
After talking with the original author of this check, it appears that it never
worked properly, since _readmarkers was always wrapped with @util.nogc.
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes