bug#38167: guix pull takes over 8 GiB of memory to finish if there are no substitutes

[Danny Milosavljevic]

Hi Ludo,

okay, I've now (permanently) unset GUIX_PACKAGE_PATH and killed the problematic 
"guix pull" process.

I run "guix pull" regularily.  Let's see what happens...

pgpb3PrLFB9jl.pgp
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