server: give user an error message if WINEARCH is not win32/win64 (try 3)

[Austin English]

CC: Ken Thomases <ken at codeweavers.com>

Try 3: move the check to where WINEARCH is used.

Supersedes https://source.winehq.org/patches/data/127820

-- 
-Austin
GPG: 14FB D7EA A041 937B
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