ICA/ItalcVncServer: drop support for pthreads-win32 in favor of winpthreads

No initialization of statically linked pthreads library required anymore.
iTALC.nsi.in: include libwinpthreads-1.dll in package
Made iTALC 2.0.2 release

Maintainance release of iTALC 2. Internal version number is v2.0.2.