BUG: Remove using anaconda system libraries update to 0.8.0.post48

Configuring SimpleITK/ITK to use the "system" libraries produced
conflicts with confusion in the CMake configuration picking some root
system libraries and include and some anaconda systems and
includes. This miss configuration results in runtime library conflicts
and abnormal program termination.

Additional the patch update to the latest SimpleITK along the release
branch, which utilizes ITK 4.6.1.