added support for building cffi on windows on arm machines

The change adds support for building cffi package on WoA(windows on arm).

Libffi for WoA has been copied from CPython binary dependencies

https://github.com/python/cpython-bin-deps/archive/libffi.zip

The change also renames the existing libffi_msvc to libffi_x86_x64 to keep things consistent.

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