comms/xnec2c: Chasing fast moving xnec2c updates upgrade to 4.4.16

- Update upstream web site

commit 54118dd983c714c442ae39867a34975417cddac0
Author: Eric Wheeler <xnec2c-git@z.ewheeler.org>
Date:   Wed Apr 24 22:32:30 2024 -0700

    Release v4.4.16

    The primary purpose of this release is to fix building on sparc64.
    Additionally, there have been several code cleanups.  I would like the thank
    Diane Bruce for inspiring the code cleanup and helping with pull requests;
    also, a big thank-you to the Debian maintainer, Dave Hibberd (@Hibby), who
    helped troubleshoot and provide guidance in solving the sparc64 build issue.

    fix set but not used warnings

    bugfix: only calculate the first frequency once

    When rc_config.main_loop_start==true, the first frequency is calculated
    twice:

    Once when the program loads, and once when the loop starts.

    This commit fixes that behavior.

    clang: fix vectorization warning:

    Update protoypes for functions with (void) that replaced ()

    Release v4.4.15

commit 1ca3b61fcc81c72a1e3c15d51ddf952015300ce5
Author: Eric Wheeler <xnec2c-git@z.ewheeler.org>
Date:   Tue Apr 16 16:36:46 2024 -0700

    glade: fix GTK crash related to menuitem icon

    Release v4.4.14
    This release fixes a hang when the frequency plots window is too small
    for the number of plots being rendered.  Thanks to Tom DL1JBE who
    reported the issue.

    prevent hang when freq plot window is too small
    show min/max values, now they do.

    Release v4.4.13

    This is a large bug-fix release and includes a few minor features and
    documentation updates. Thank you to the many contributors who helped
    with new features and bug fixes!

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