Windows builds

[Brian Hook]

Ack, sent from wrong account.  Anyways, here's a message I meant to 
send earlier...

>The latest CVS doesn't compile on Windows.  I've updated my local
>version and can provide a patch for whomever.  I've also taken the
>liberty of renamed UpdateHardwareGamma() to
>GLimp_UpdateHardwareGamma().
>
>The specific problems encountered included:
>
>- lack of have_stencil for the Windows GL implementation - CD audio
>wouldn't compile (missing brace and return value)
>
>It now builds, haven't checked to see if it runs yet, will do that
>tomorrow hopefully once I remember all the proper command line
>switches to tell it where the data is, etc.
>
>-Hook