Add CMakeLists.txt file for Windows x86_64 MSVC build

Bug: none
Test: external\python\cpython3\kokoro\kokoro_build.cmd
Test: py -3 external\python\cpython3\kokoro\prepare_windows_externals.py
Test: kokoro presubmit for ndk/python3/windows_presubmit job
Change-Id: Ic5e221a5f3608971453cf957a19af2018867424e