msvcrt/tests: use an MS ABI vararg list for x86_64

[Juan M. Navarro]

Replaced va_list by __ms_va_list, va_start by __ms_va_start, and va_end by
__ms_va_end for x86_64.
No regressions found on 64-bit and 32-bit modes.

Thanks,
Juan

-- 
Juan M. Navarro
Mobile: (773) 339-4160
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