This removes the trailing slashes from the path and then removes dirs
set twice in XDG_DATA_DIRS (always removes those from the right side).
There's no use for duplicit dirs in XDG_DATA_DIRS because if whatever is
being looked up is not found in the duplicated dir the first time, it
won't be there the second time.
Currently it causes troubles for example in mime types, where it returns
duplicated mime types as the same dir is searched multiple times.
For obtaining the original value of XDG_DATA_DIRS, one can use
qgetenv("XDG_DATA_DIRS").
Change-Id: Ic4f8ef6c6fe096555948e318899207e9d4ca8289
Reviewed-by: David Faure KDE (deprecated, use kdab instead) <faure@kde.org>
9deacd7f20