COMP: Fix WrapITK.pth path on windows
Created by: vovythevov
The WrapITK path isn't taking in consideration the multi-configuration style for windows. Adding the CMAKE_CFG_INTDIR variable fixes this.
Since on other single configuration generators (like make) the variable reduces to ".", we can simply interject it where needed.
Tested on windows and unix.
Reviewed-by: Jean-Christophe Fillion-Robin email@example.com