[Cin] dynamic linking on not-BSD

[Andrew Randrianasulu]

probably was broken by

https://git.cinelerra-gg.org/git/?p=goodguy/cinelerra.git;a=commit;h=435f84402323118397a408c1b0c90aa59b321286

adds -lexecinfo and friends to cinelerra/Makefile, they usually not
availabe on std. Linux (saw them on musl-based Alpine Linux)
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