novidia: add shader.farc xdelta/vcdiff patching

source-code/dependencies/xdelta3/README.md

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+Xdelta 3.x readme.txt
+Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+2009, 2010, 2011, 2012, 2013, 2014, 2015
+<josh.macdonald@gmail.com>
+
+
+Thanks for downloading Xdelta!
+
+This directory contains the Xdelta3 command-line interface (CLI) and source
+distribution for VCDIFF differential compression, a.k.a. delta
+compression. The latest information and downloads are available here:
+
+  http://xdelta.org/
+  http://github.com/jmacd/xdelta/
+
+Xdelta can be configured to use XZ Utils for secondary compression:
+
+  http://tukaani.org/xz/
+
+The command-line syntax is detailed here:
+
+  https://github.com/jmacd/xdelta/blob/wiki/CommandLineSyntax.md
+
+Run 'xdelta3 -h' for brief help.  Run 'xdelta3 test' for built-in tests.
+
+Sample commands (like gzip, -e means encode, -d means decode)
+
+  xdelta3 -9 -S lzma -e -f -s OLD_FILE NEW_FILE DELTA_FILE
+  xdelta3 -d -s OLD_FILE DELTA_FILE DECODED_FILE
+
+File bug reports and browse open support issues here:
+
+  https://github.com/jmacd/xdelta/issues
+
+The source distribution contains the C/C++/Python APIs, Unix, Microsoft VC++
+and Cygwin builds.  Xdelta3 is covered under the terms of the APL, see
+LICENSE.