[SHLWAPI] PathSearchAndQualify function

[Flameeyes]

This patches add an incomplete support for PathSearchAndQualify
function.
MSDN Online seems not provide important informations about it, but with
trivial tests, it seems to convert a relative path to an absolute one,
without checking if it's correct, and exists.
It never returned 0 in my tests by now, but I haven't direct access to a
windows box, so the tests are not exaustive.
At least, my software seems to use it correctly.
-- 
Flameeyes <dgp85 at users.sf.net>
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