cmake: Ensure latest version of the soure if checked out

Author: jcfr

CMakeLists.txt

@@ -36,12 +36,11 @@ if(SimpleITKPythonPackage_SUPERBUILD)
     set( ENV{MAKEFLAGS} "-j${NPROC}" )
   endif()
 
-
   #-----------------------------------------------------------------------------
   include(ExternalProject)
 
   set(SimpleITK_REPOSITORY git://github.com/jcfr/SimpleITK)
-  set(SimpleITK_GIT_TAG "simpify-python-packaging") #v0.10.0)
+  set(SimpleITK_GIT_TAG "origin/simpify-python-packaging") #v0.10.0)
 
   # Add an empty external project
   function(sitk_ExternalProject_Add_Empty proj depends)