bug#73905: guix shell changes default sigaction for SIGPIPE

[Tomas Volf]

Guix shell changes the default handler for SIGPIPE for the command it
runs.  Can be demonstrated using the following:

--8<---------------cut here---------------start------------->8---
$ guix shell guile -- guile -c '(pk (sigaction SIGPIPE))'

;;; ((1 . 0))
$ guile -c '(pk (sigaction SIGPIPE))'

;;; ((0 . 0))
--8<---------------cut here---------------end--------------->8---

Have a nice day,
Tomas Volf

-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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