Correct declarations for aarch64-pc-windows-msvc

Reference issue

I tried to use clang for windows to build it with target aarch64-pc-windows-msvc. but it was failed in PacketMath.h because clang is not compatible for arm_neon.h (MSVC Version). so I add EIGEN_COMP_CLANG == 0 to prevent using MSVC declaration.

What does this implement/fix?

I add EIGEN_COMP_CLANG == 0 to do not use MSVC declaration.

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