[Cin] small build fix for libbthread-master Makefile

[Phyllis Smith]

Thanks.  Will check into GIT next time I boot the desktop.  Along with
Rob's ffmpeg video render format - h264-nvenc.qt .

On Sun, Jan 8, 2023 at 1:03 AM Andrew Randrianasulu via Cin <
cin at lists.cinelerra-gg.org> wrote:

> otherwise build fails on Freebsd 12.3 amd64
> (used blds/bsd.bld)
>
>
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> Cin at lists.cinelerra-gg.org
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