Add official allocations for extended desktop size extension.


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@3704 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/rfb/encodings.h b/common/rfb/encodings.h
index 2f3b430..17c7f29 100644
--- a/common/rfb/encodings.h
+++ b/common/rfb/encodings.h
@@ -33,7 +33,7 @@
   const unsigned int pseudoEncodingXCursor = 0xffffff10;
   const unsigned int pseudoEncodingCursor = 0xffffff11;
   const unsigned int pseudoEncodingDesktopSize = 0xffffff21;
-  const unsigned int pseudoEncodingExtendedDesktopSize = 0xfffffecb; // FIXME: Unofficial
+  const unsigned int pseudoEncodingExtendedDesktopSize = 0xfffffecc;
   const unsigned int pseudoEncodingDesktopName = 0xfffffecdl;
 
   // TightVNC-specific