add ioctl tests

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on May 04, 2011 15:00:27_

currently ioctl handling is based on what's seen in net_unittests so that will server for now as testing (although some of the winsock calls are coming from injected libs from other software on the system and isn't from net_unittests itself :)). long-term should add or perhaps can find basic tests of all winsock functions: at least as no-error tests, ideally adding drmem-specific tests that pass uninit data to syscalls deliberately to test false negatives. that's a lot of work though so there are tradeoffs here to manage.

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=379_