Added Oculus SDK 0.2.5c.

This is the contents of the ZIP and .tar.gz files from the Oculus developer site plus the following changes:
* OVR_Profile.cpp contains a fix to allow fetching the home directory on a Linux machine where the accounts come from a Windows domain controller.
* The OSX libraries have been rebuilt with RTTI turned on.
	Upgraded IHmdSystem:
	* Added config and log paths to the Init function so Steam can tell us where to put that stuff.
	* Switched VR_GetControlPanel to VR_GetGenericInterface so it will work for any interface and not just the control panel interface
	* Added interface adapters for IHmdSystem versions. Added version 2.
	* Added env vars so vrclient.dll can tell vrserver.exe where to put its log and config files
	* Added interfaces to find for all the CURRENT versions of IHmdSystem, IHmd, and IVRControlPanel
Binaries to go with all the recently updated source.
Added missing file that's needed for linux builds.
Fixed typo in VR_OVERRIDE
added 64bit linux build for vrclient vrserver and driver_oculus