[PATCH] Unify OUTPATH values

[Francois Tigeot]

Hi,

I don't think there's any good reason to have wildly different OUTPATH names
for each specific platform variant.

The various names also lead to unnecessary work when packaging, just to
correctly handle LD_LIBRARY_PATH.

The attached patch reduces OUTPATH to two possible values: unx and wnt. Since
it is potentially intrusive, I prefer to show it here for review instead of
committing it directly.

-- 
Francois Tigeot