link separate binaries for JuliaInterface for separate Julia versions

[fingolfin]

Right now, if one uses the same GAP.jl version in multiple Julia versions on one computer, this can lead to crashes because all those Julia versions will end up sharing the same .julia/packages/GAP/??????/pkg/JuliaInterface/bin/x86_64-apple-darwin14-julia64-kv8/JuliaInterface.so loadable module; but that .so file actually strongly depends on the Julia version it was linked against.

One way to fix this would be to extend the GAP arch string yet again, and insert the Julia version (at least the major.minor part, or perhaps just the minor part into it. So e.g. x86_64-apple-darwin14-julia64-kv8 would perhaps becomes x86_64-apple-darwin14-julia1.6-64-kv8

Another way to resolve it would be to have a JuliaInterface JLL, see #619

[ThomasBreuer]

I think this problem occurs not only for JuliaInterface but also for other GAP packages.

[fingolfin]

This should be resolved in GAP.jl 0.8.0, where the GAPARCH now indeed contains the Julia version, e.g. aarch64-apple-darwin20-julia64-kv8-1.8 or x86_64-apple-darwin14-julia64-kv8-1.7