convert -3 error building docs

[Bruno Postle]

This code in configure.ac tries to substitute 'convert' for 'tiff2ps' if tiff2ps isn't found:

AC_PATH_PROG(TIFF2PS, tiff2ps, false)
if test "$TIFF2PS" = false; then
    if test "$CONVERT" != false; then
        AC_MSG_WARN(cannot find tiff2ps; will substitute convert)
        TIFF2PS="$CONVERT"
        TIFF2PS_FLAGS=""
    else
        AC_MSG_WARN(cannot find tiff2ps; will not be able to build PostScript documentation)
        can_build_doc=no
        missing_for_doc="$missing_for_doc tiff2ps"
    fi
fi

..but then this fails calling `convert -3` which isn't a valid convert command.

Other than that, once I have all the right dependencies installed, I can now successfully build html, dvi, ps and pdf docs - It's a long time since this worked on fedora!

[Christoph Spiel (cspiel)]

Should be fixed in rev 0c051e944b27.

We no longer use tiff2ps(1) at all. The job gets done by convert(1).
Thus, there is no TIFF2PS_FLAGS anymore.