Fix julia library jl_init_with_image bug

[aidan-curtis]

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A possible solution to #437

jl_init_with_image and jl_init_with_image__threading are no longer exposed functions in the Julia 1.6 library, whereas jl_init__threading seems to work.

This also requires setting the DYLD_LIBRARY_PATH so Julia can locate the system image. export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:/Applications/Julia-1.6.app/Contents/Resources/julia/lib/

[iamed2]

AFAICT jl_init_with_image__threading is still exposed, just like jl_init__threading

[aidan-curtis]

You're right. This is just a temporary workaround until jl_init_with_image__threading is fixed.