Don't rely on implicit binding creation by setglobal (#102)

As discussed in [1], the implicit creation of bindings through the
setglobal! intrinsic was accidentally added in 1.9 unintentionally
and will be removed (ideally) or at the very least deprecated in 1.11.

The recommended replacement syntax is `Core.eval(mod, Expr(:global, sym))` to
introduce the binding and `invokelatest(setglobal!, mod, sym, val)` to set
it. The invokelatest is not presently required, but may be required
for JuliaLang/julia#54654, so it's included
in the recommendation.

[1] JuliaLang/julia#54607

src/clusterserialize.jl

@@ -167,10 +167,11 @@ function deserialize_global_from_main(s::ClusterSerializer, sym)
             return nothing
         end
     end
+    Core.eval(Main, Expr(:global, sym))
     if sym_isconst
         ccall(:jl_set_const, Cvoid, (Any, Any, Any), Main, sym, v)
     else
-        setglobal!(Main, sym, v)
+        invokelatest(setglobal!, Main, sym, v)
     end
     return nothing
 end