Bug#4055: Incorrect .so requests in libtiff man pages

[Yves Arrouye <Yves.Arrouye@marin.fdn.fr>]

Package: libtiff3-dev
Version: 3.4beta034-1

Many .3t manual pages have .so requests like

        .so SomePage.3t

instead of

        .so man3/SomePage.3t

making the manual pages unusable.

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