bug#38411: HTTP pipelining of narinfo requests broken for https://ci.guix.gnu.org

[Ludovic Courtès]

nginx 1.17.6 is similarly broken:

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root@berlin ~/maintenance/hydra# guix describe
Generation 45   Nov 28 2019 11:02:51    (current)
  guix 18a5575
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 18a5575ec530f0e7a2e27f2aa3b5addf20da0f87
root@berlin ~/maintenance/hydra# guix build nginx
/gnu/store/6q44kjf59rgkvn0ip8m0454ybszhjpy0-nginx-1.17.6
root@berlin ~/maintenance/hydra# guix gc --references $(guix build nginx)|grep 
ssl
/gnu/store/1dvkm6b97667qd36rsnw4g6isnsmpym7-openssl-1.1.1d
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Ludo'.