Need to include os/print.h to use snprintf on Windows


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4634 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/rfb/JpegCompressor.cxx b/common/rfb/JpegCompressor.cxx
index a55fee7..7a870b0 100644
--- a/common/rfb/JpegCompressor.cxx
+++ b/common/rfb/JpegCompressor.cxx
@@ -21,6 +21,7 @@
 #include <rdr/Exception.h>
 #include <rfb/Rect.h>
 #include <rfb/PixelFormat.h>
+#include <os/print.h>
 
 using namespace rfb;