Make sure Windows specific code is only included in Windows builds.

Patch by Henrik Andersson.


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4334 3789f03b-4d11-0410-bbf8-ca57d06f2519

common/rfb/CMakeLists.txt

   UpdateTracker.cxx
   VNCSConnectionST.cxx
   VNCServerST.cxx
-  WinPasswdValidator.cxx	# Windows specific code
   ZRLEEncoder.cxx
   ZRLEDecoder.cxx
   encodings.cxx
   util.cxx)
 
+if(WIN32)
+  set(RFB_SOURCES ${RFB_SOURCES} WinPasswdValidator.cxx)
+endif(WIN32)
+
 set(RFB_LIBRARIES ${JPEG_LIBRARIES} os)
 
 if(GNUTLS_FOUND)