guiAviBitmapCtrl Windows ONLY fix

[b]In engine\gui\guiAviBitmapCtrl.h[/b]

Change the below line (11) from:

	#if !ENABLE_AVI_GUI || !ENABLE_MPG_GUI

to

	#if !ENABLE_AVI_GUI && !ENABLE_MPG_GUI

[b]In engine\gui\guiAviBitmapCtrl.cc[/b]

Change the below line (23) from:

	#define  ENABLE_AVI_GUI    0

to

	#define  ENABLE_AVI_GUI    1

Change the below line (46) from:

	#if !ENABLE_AVI_GUI || !ENABLE_MPG_GUI

to

	#if !ENABLE_AVI_GUI && !ENABLE_MPG_GUI

Replace the entire function GuiAviBitmapCtrl::sndOpen() (lines 101-117) with the below code:

bool GuiAviBitmapCtrl::sndOpen()
{
   char               fileBuffer[1024];
   Audio::Description desc;

   // Build the audio description
   desc.mVolume    = 1.0f;
   desc.mIsLooping = false;
   desc.mIs3D      = false;
   desc.mType      = 0;

   // Create the audio source
   dSprintf(fileBuffer, sizeof(fileBuffer), "%s", mWavFilename);
   mWavHandle = alxCreateSource(&desc, fileBuffer, 0);

   return (mWavHandle != NULL_AUDIOHANDLE);
}

// Issue the below command at the console:
   //
   //    exec("fps/AVI/avitest.cs");
   //

   new GuiControlProfile (IntroProfile)
      {
      opaque      = false;
      fillColor   = "0 0 0";
      fillColorHL = "0 0 0";
      fillColorNA = "0 0 0";
      tab         = true;
      canKeyFocus = true;
      };

   // Create the GuiAviBitmapCtrl
   new GuiAviBitmapCtrl(IntroGui)
      {
      profile = "IntroProfile";
      horizSizing = "width";
      vertSizing = "height";
      position = "0 0";
      extent = "640 480";
      minExtent = "8 8";
      visible = "1";
      variable = "";
      helpTag = "0";
      useVariable = "1";
      aviFileName = "fps/AVI/test.avi";
      wavFileName = "fps/AVI/test.wav";
      setFirstResponder = "1";
      letterBox = true;
//      letterBox = false;
      swapRB = true;
      };

   Canvas.pushDialog(IntroGui);
   Canvas.hideCursor();
   IntroGui.play();
   schedule(100, 0, checkIntroDone);

//-----------------------------------------------------------------------------
function checkIntroDone()
{
   if (IntroGui.done)
      {
      Canvas.popDialog(IntroGui);
      Canvas.showCursor();
      IntroGui.delete();
      IntroProfile.delete();
      }
   else
      schedule(100, 0, checkIntroDone);
}