Cron: integration with Role Watchdog (and possibly other user role modules)

The title may not be the best, so hopefully this is a good enough description. I encountered this with Role Watchdog, but I can imagine it being a problem with other modules that use hook_user().

Role Watchdog uses hook_user() to monitor changes to user roles, and logs the changes.

The program flow:

role_expire_cron() calls user_save(), which ends up firing Role Watchdog's hook_user(), but Role Watchdog isn't receiving the correct information in order to record the change.

It appears that this is because Role Watchdog is expecting these parameters to hook_user(), which in my observation is standard:

$account - the original user data.

$edit - the new values to save to the user.

However, role_expire_cron() is passing a modified user object, so Role Watchdog can't distinguish the "new" from the "old," and thus doesn't record the change.

This patch appears to solve it for me.