[PR PATCH] common/build-style/python3-pep517: add missing \n for msg_warn

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

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

https://github.com/JamiKettunen/void-packages pep517-newline
https://github.com/void-linux/void-packages/pull/40426

common/build-style/python3-pep517: add missing \n for msg_warn
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Fixes the following (missing newline) for this warning:
![image](https://user-images.githubusercontent.com/47358222/200971182-8f275696-2d34-424b-af51-de9d0a88262e.png)


#### Testing the changes
- I tested the changes in this PR: **YES**

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A patch file from https://github.com/void-linux/void-packages/pull/40426.patch is attached

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From e17bb5614399ba3f089c737a91d464b59249ca48 Mon Sep 17 00:00:00 2001
From: Jami Kettunen <jami.kettunen@protonmail.com>
Date: Thu, 10 Nov 2022 02:27:52 +0200
Subject: [PATCH] common/build-style/python3-pep517: add missing \n for
 msg_warn

---
 common/build-style/python3-pep517.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/build-style/python3-pep517.sh b/common/build-style/python3-pep517.sh
index da1e238e1192..0994384aacfa 100644
--- a/common/build-style/python3-pep517.sh
+++ b/common/build-style/python3-pep517.sh
@@ -20,7 +20,7 @@ do_check() {
 		fi
 		${make_check_pre} python3 -m pytest ${testjobs} ${make_check_args} ${make_check_target}
 	else
-		msg_warn "Unable to determine tests for PEP517 Python templates"
+		msg_warn "Unable to determine tests for PEP517 Python templates\n"
 		return 0
 	fi
 }