bug#56030: The guix pull profile is too big

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On Thu Jul 21, 2022 at 4:46 PM BST, Maxime Devos wrote:
> Using SHELL_PATH instead of the __guix_bin_sh sounds better, yes.  But 
> it's not 'just use -DSHELL_PATH=', we still need to change 'system' 
> appropriately.
Why would we need to change it? The glibc definition already uses that
macro for the shell path, it's just hard-coded to /bin/sh by default.