calc: C-style arbitrary precision system Files

The following are the changes in this release:

    Fixed warning about undefined operations involving the qlink(q)
    macro by replacing that macro with an inline-function.  Thanks goes
    to David Haller <dnh at opensuse dot org> for this fix.

    NOTE for Windows 10 users: Pavel Nemec <pane at seznam dot cz>
    reported that calc version 2.12.6.4 has been successfully
    compiled, installed and running on Windows 10.  See README.WINDOWS
    for more details.

    Improved gen_v1(h,n) in lucas.cal to use an even faster search method.

    Improved are checking in lucas.cal.  In particular both h and n must be
    integers >= 1.  In the case of both rodseth_xhn(x, h, n) and gen_v1(h, n)
    h must be odd.

    Fixed an C code indenting issue that was reported by Thomas Walter
    <th dot walter42 at gmx dot de> in zfunc.c.

    Fixed a man page warning about ./myfile where the leading dot
    was mistook for an nroff macro.  Thanks goes to David Haller
    <dnh at opensuse dot org> for providing the patch.

    Improved gen_v1(h,n) in lucas.cal for cases where h is not a
    multiple of 3. Optimized the search for v(1) when h is a
    multiple of 3.

    Fixed a Makefile problem, reported by Doug Hays <doughays6 at gmail
    dot com>, where if a macOS user set BINDIR, LIBDIR, CALC_SHAREDIR
    or INCDIR in the top section, their values will be overwritten by
    the Darwin specific section.