Update libjpeg-turbo to 1.2.

jcparam.c

 /*
  * jcparam.c
  *
  * Copyright (C) 1991-1998, Thomas G. Lane.
  * Modified 2003-2008 by Guido Vollbeding.
- * Copyright (C) 2009-2010, D. R. Commander.
+ * Copyright (C) 2009-2011, D. R. Commander.
  * This file is part of the Independent JPEG Group's software.
  * For conditions of distribution and use, see the accompanying README file.
  *
  * This file contains optional default-setting code for the JPEG compressor.
  * Applications do not have to use this file, but those that don't use it
  * must know a lot more about the innards of the JPEG code.
  */
 
 #define JPEG_INTERNALS
 #include "jinclude.h"
@@ skipping 374 matching lines @@
   case JCS_GRAYSCALE:
     jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
     break;
   case JCS_RGB:
   case JCS_EXT_RGB:
   case JCS_EXT_RGBX:
   case JCS_EXT_BGR:
   case JCS_EXT_BGRX:
   case JCS_EXT_XBGR:
   case JCS_EXT_XRGB:
+  case JCS_EXT_RGBA:
+  case JCS_EXT_BGRA:
+  case JCS_EXT_ABGR:
+  case JCS_EXT_ARGB:
     jpeg_set_colorspace(cinfo, JCS_YCbCr);
     break;
   case JCS_YCbCr:
     jpeg_set_colorspace(cinfo, JCS_YCbCr);
     break;
   case JCS_CMYK:
     jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */
     break;
   case JCS_YCCK:
     jpeg_set_colorspace(cinfo, JCS_YCCK);
@@ skipping 225 matching lines @@
     scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2);
     /* Successive approximation second pass */
     scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1);
     /* Successive approximation final pass */
     scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
     scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0);
   }
 }
 
 #endif /* C_PROGRESSIVE_SUPPORTED */