wineprefixcreate: more stringent sanity check (try 2)

[Dan Kegel]

(Moved check to wineprefixcreate as Alexandre suggested.)

Many newbies mistakenly run wine as root.  Catch
this in wineprefixcreate and direct them to the wiki.
Power users can bypass the check with --nosanitycheck.
Fixes the remainder of http://bugs.winehq.org/show_bug.cgi?id=10324
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