pacman/upgrade: switch to new interface

Note that there is a behavior change here : if the same package name
appeared several times in the target list, the alpm_add_target interface
chooses the new package, while alpm_add_pkg returns PKG_DUP.

I don't see why we cannot unify the behavior of -S and -U, and just
choose one behavior that applies to both.

Otherwise, it's always possible to handle these different behaviors in
the frontend, it just requires more work.

Signed-off-by: Xavier Chantry <chantry.xavier@gmail.com>

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