bug#56030: The guix pull profile is too big

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> We could compile a '__guix_shell_path = "/..."' during the compilation 
> of the package (as a .o) and wrap gcc to insert it to the CLI arguments, 
> no linker scripts required.
Alas, for some reason I couldn't find any documentation on how to define
strings in a linker script. But never mind that, since that's a far
better idea :)

> Not all linkers support linker scripts, e.g. mold doesn't from what I've
> read because they make the linker slower.
Would we really need to support anything other than ld, gold, and lld,
though?

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