[PR PATCH] xbps-src: keep http_proxy and other lowercase proxy variables

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

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

https://github.com/tornaria/void-packages http_proxy
https://github.com/void-linux/void-packages/pull/41435

xbps-src: keep http_proxy and other lowercase proxy variables
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#### Testing the changes
- I tested the changes in this PR: **briefly**

From `curl` manpage:
```
ENVIRONMENT
       The environment variables can be specified in lower case or upper case.
       The lower case version has precedence. http_proxy is an exception as it
       is only available in lower case.
```

I have `http_proxy` and `https_proxy` set, and then `xbps-src update-check` would not use the proxy. With this commit, it works as expected.

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A patch file from https://github.com/void-linux/void-packages/pull/41435.patch is attached

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From 238eee31e52c394e1d1aeaa155482eed3d103666 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gonzalo=20Tornar=C3=ADa?= <tornaria@cmat.edu.uy>
Date: Wed, 4 Jan 2023 10:25:10 -0300
Subject: [PATCH] xbps-src: keep http_proxy and other lowercase proxy variables

---
 common/environment/setup/sourcepkg.sh | 2 ++
 common/xbps-src/shutils/chroot.sh     | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/common/environment/setup/sourcepkg.sh b/common/environment/setup/sourcepkg.sh
index a7f98b57d6f7..4e3b4e98ba43 100644
--- a/common/environment/setup/sourcepkg.sh
+++ b/common/environment/setup/sourcepkg.sh
@@ -25,6 +25,8 @@ for var in $(awk 'BEGIN{for (i in ENVIRON) {print i}}' </dev/null); do
 		;;
 	FTP_PROXY | FTP_RETRIES)
 		;;
+	http_proxy | https_proxy | ftp_proxy | all_proxy | no_proxy)
+		;;
 	*)
 		unset -v "$var"
 		;;
diff --git a/common/xbps-src/shutils/chroot.sh b/common/xbps-src/shutils/chroot.sh
index a7100d4ea56f..823705030b97 100644
--- a/common/xbps-src/shutils/chroot.sh
+++ b/common/xbps-src/shutils/chroot.sh
@@ -165,6 +165,11 @@ chroot_handler() {
     else
         env -i -- PATH="/usr/bin:$PATH" SHELL=/bin/sh \
             HOME=/tmp IN_CHROOT=1 LC_COLLATE=C LANG=en_US.UTF-8 \
+            ${http_proxy:+http_proxy="${http_proxy}"} \
+            ${https_proxy:+https_proxy="${https_proxy}"} \
+            ${ftp_proxy:+ftp_proxy="${ftp_proxy}"} \
+            ${all_proxy:+all_proxy="${all_proxy}"} \
+            ${no_proxy:+no_proxy="${no_proxy}"} \
             ${HTTP_PROXY:+HTTP_PROXY="${HTTP_PROXY}"} \
             ${HTTPS_PROXY:+HTTPS_PROXY="${HTTPS_PROXY}"} \
             ${FTP_PROXY:+FTP_PROXY="${FTP_PROXY}"} \