ndis.sys: add NdisAllocateSpinLock stub (try 2)

[Austin English]

Fixes https://bugs.winehq.org/show_bug.cgi?id=39933

This is the last unimplemented function called by iNode (during
startup, at least, didn't test beyond that).

Try 2: add missing spec file entry (thanks Alexandre)

-- 
-Austin
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