disable testing for SimpleITK-python

This created additional dependencies that were problematic

Author: blowekamp

CMakeLists.txt

@@ -209,6 +209,7 @@ if(SimpleITKPythonPackage_SUPERBUILD)
       -DPYTHON_INCLUDE_DIR:PATH=${PYTHON_INCLUDE_DIR}
       -DPYTHON_LIBRARY:PATH=${PYTHON_LIBRARY}
       -DPYTHON_EXECUTABLE:PATH=${PYTHON_EXECUTABLE}
+      -DBUILD_TESTING:BOOL=OFF
       -DSimpleITK_PYTHON_THREADS:BOOL=${SimpleITK_PYTHON_THREADS}
       -DSimpleITK_DIR:PATH=${SimpleITK_DIR}
       -DSWIG_EXECUTABLE:PATH=${SWIG_EXECUTABLE}