Log Message:
Update to 4.0.2 for CVE-2012-2113.

     * tif_getimage.c: added support for _SEPARATED CMYK images.
     * tif_getimage.c: Added support for greyscale + alpha.
     * Added TIFFCreateCustomDirectory() and TIFFCreateEXIFDirectory()
       functions.
     * tif_print.c: Lots of fixes around printing corrupt or hostile input.
     * Improve handling of corrupt ycbcrsubsampling values.
     * tif_unix.c: use strerror to get meaningful error messages.
     * tif_jpeg.c: fix serious bugs in JPEGDecodeRaw().
     * tif_jpeg.c: Fix size overflow (zdi-can-1221,CVE-2012-1173).