Refactor the settings of $docdir

This is a completely noop change for this project, since before this
commit nothing was using $docdir nor PROGRAM_TARNAME.

Setting the fourth parameter of AC_INIT() makes it set PROGRAM_TARNAME,
which then used as the last path component of the default docdir,
effectively making $docdir be the same as the previous

Signed-off-by: Mattia Rizzolo <>
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