change info message to only appear during precompilation

[Jutho]

No description provided.

[lkdvos]

Did you check if this does what we want? I don't really recall, but I remember having some issues making sure this actually prints to the repl

[Jutho]

Yes this prints to the repl, at least when doing "using TensorOperations" after it got updated and needs to be recompiled (possibly not if "using SomeHigherLevelPackageThatDependsOnTensorOperations"). I first tried to add a print statement to "deps/build.jl", but that just gets printed to a "build.log" file and an info message is printed to the REPL to say that there is some extra info in the "build.log" file.

[Jutho]

Ok I can now confirm that the info message is also shown when TensorOperations is compiled as a consequence of being loaded in implicitly by a higher level package, so I will merge and tag.

[lkdvos]

The build step was also the first thing I tried, great minds :)