checkpkg: implement comparison against alternative targets

This allows comparing the currently built set of packages against
targets named by filename, url, or pkgname. One example use is to
compare a package against a different version that was never in the
repos; another example use is to compare a *-git package against the
non-git version.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

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