More Java viewer clipboard handler fixes

* Override TransferHandler.exportToClipboard method to ensure that
  serverCutText updates get sent to the system clipboard.  This
  wasn't always happening when relying on the super class' paste()
  method alone.
* Removed some unnecessary setText() statements and one check for
  whether sending client cut text is enabled.

(cherry picked from commit 4f95737b72a516f0ca2ffdd1d299b7469ea90962)
Remove libvnc server module from statically built versions

* The static libvnc server module can't be loaded anyway so just
  remove it from the el5 and portable binaries.

(cherry picked from commit 5694c3aff98814efe564442c126993863a8b2968)