Add a alcGetProcAddress2 function

This is essentially just a copy of alcGetProcAddress. It's purpose is to bypass
Creative's router's alcGetProcAddress implementation, which returns its own
functions even if given a device handle. When combined with it also wrapping
the drivers' device and context handles, that prevents any extention function
that needs a recognizable device or context handle from working, like the
*Direct functions, as there's no way for the app to get a device or context
handle the driver can know about).

An alternate function to get function pointers allows a driver to return its
own implementation for standard and extension functions, which an application
can use to "bootstrap" audio to use a particular driver directly, enabling
use of extensions that the router gets in the way of (and also avoid the
overhead of the router, however small that may be).

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