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 jchris.fillionr@kitware.com