BufferedImage performance is poor on Microsoft Windows platforms, so fallback to...

BufferedImage performance is poor on Microsoft Windows platforms, so fallback to the 1.2 implementation if the BI cannot be HW accelerated.  Also streamline some of the code by removing synchronized statements and making the method calls themselves synchronized.  Modification to the selector implementation to make it behave more like a unix selector

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4880 3789f03b-4d11-0410-bbf8-ca57d06f2519