- Remove the cloog.info that is in the tarball That forces the regeneration
        of a new cloog.info with suitable INFO_DIR_SECTION, so that
        install-info doesn't cry at install time.
    - Slightly changed the patch to make install-info actually install the
        cloog information in the info directory file.
    - Run install-info --delete in %preun, not in %postun, otherwise the info
        file is long gone with we try to run install-info --delete on it.