Handle already-set-up MSVC environments targeting AArch64/ARM. #4625
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This PR prevents LDC from clobbering an already-set-up MSVC environment that targets AArch64 or ARM, addressing #4624.
It doesn't add the ability to automatically set-up an MSVC environment for targeting AArch64 or ARM when that's what LDC is targeting, but not clobbering existing environments is a nice improvement.