bug#37047: git needs sed either as propagated input or as input (with some substitute*-work)

[Björn Höfling]

guix environment --container -N --ad-hoc go coreutils binutils less  emacs grep 
findutils git nss-certs

[env] $ go get github.com/fatih/structs 
# cd /home/bjoern/go/src/github.com/fatih/structs; git submodule update --init 
--recursive
/gnu/store/i89f4rw8a2nzppxf2yixl0hvcw46rsxv-git-2.22.0/libexec/git-core/.git-submodule-real:
 line 7: sed: command not found
/gnu/store/kiykcyp4n45c7prba3k3zvfz19vvmymd-profile/libexec/git-core/git-sh-setup:
 line 86: sed: command not found
/gnu/store/i89f4rw8a2nzppxf2yixl0hvcw46rsxv-git-2.22.0/libexec/git-core/.git-submodule-real:
 line 1115: sed: command not found
/gnu/store/i89f4rw8a2nzppxf2yixl0hvcw46rsxv-git-2.22.0/libexec/git-core/.git-submodule-real:
 line 1115: cmd_: command not found
package github.com/fatih/structs: exit status 127

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