wineloader: call wineprefixcreate with explicit WINEPREFIX

[Crestez Leonard]

This allows you do "export WINEPREFIX=~/.wine-zzz; ./wine regedit",
and automatically generate ~/.wine-zzz. You used to have to call
wineprefixcreate yourself

Changelog:
	fix winewrapper not calling wineprefixcreate with explicit WINEPREIFIX
-- 
Crestez Leonard <cleonard at go.ro>
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