Hi Efraim, Simon,

The attached patches provide Simon's suggested julia-deterministic
build.

With this, I get deterministic julia build, *but* only on a single
machine.  Building on a different machine I get a different output.  I
still need to investigate why.  Also, some of the patches are probably
not needed at all.  In the near future, as discussed previously, I aim
at submitting required patches upstream.

I disabled tests in julia-deterministic, so it get built quite fast
(~10minutes).  If you want to try to see if this is reproducible//know
how to figure out what might be happening on different machines,
feedback is wellcome!

My ouptut is (patches applied on 75741af9b2):
guix hash -r /gnu/store/mp8hl7j09nfnsxbb3a6ka23ww44gq0z2-julia-deterministic-1.4.1
1k6mak38nkiaj0b9l6rcmxfcjwvbijmczxs703hgawwi6z0jikxl