[PR PATCH] zsh: add alternative for sh

[SimonPersson <SimonPersson@users.noreply.github.com>]

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There is a new pull request by SimonPersson against master on the void-packages repository

https://github.com/SimonPersson/void-packages zsh-alternative
https://github.com/void-linux/void-packages/pull/34540

zsh: add alternative for sh
#### Testing the changes
- I tested the changes in this PR: **YES**

The system boots and basic usage seems to work fine with zsh as `/bin/sh`.


#### Local build testing
- I built this PR locally for my native architecture, x86_64-glibc



A patch file from https://github.com/void-linux/void-packages/pull/34540.patch is attached

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From 112c5ac1645b2bba3b7c0b22724bc1df5f872244 Mon Sep 17 00:00:00 2001
From: Simon Persson <simon@flaskpost.me>
Date: Tue, 14 Dec 2021 22:29:13 +0100
Subject: [PATCH] zsh: add alternative for sh

---
 srcpkgs/zsh/template | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/srcpkgs/zsh/template b/srcpkgs/zsh/template
index a7aea22e18d9..a8e1291cea8d 100644
--- a/srcpkgs/zsh/template
+++ b/srcpkgs/zsh/template
@@ -27,6 +27,10 @@ register_shell="/bin/zsh /usr/bin/zsh"
 lib32disabled=yes
 conf_files="/etc/zsh/*"
 
+alternatives="
+ sh:sh:/usr/bin/zsh
+ sh:sh.1:/usr/share/man/man1/zsh.1"
+
 post_patch() {
 	# Set correct keymap path
 	sed -i 's#/usr/share/keymaps#/usr/share/kbd/keymaps#g' \