Basic infrastructure to support fences.


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4798 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/rfb/encodings.h b/common/rfb/encodings.h
index 40f5f10..84844c5 100644
--- a/common/rfb/encodings.h
+++ b/common/rfb/encodings.h
@@ -36,6 +36,7 @@
   const int pseudoEncodingDesktopSize = -223;
   const int pseudoEncodingExtendedDesktopSize = -308;
   const int pseudoEncodingDesktopName = -307;
+  const int pseudoEncodingFence = -312;
 
   // TightVNC-specific
   const int pseudoEncodingLastRect = -224;