[PR PATCH] common/xbps-src/shutils/update_check.sh: ignore pkgs without distfiles

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

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

https://github.com/classabbyamp/void-packages update-check-fixes
https://github.com/void-linux/void-packages/pull/38971

common/xbps-src/shutils/update_check.sh: ignore pkgs without distfiles
...unless they use the update override file

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


A patch file from https://github.com/void-linux/void-packages/pull/38971.patch is attached

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From 038f92114d5a056e966b530c68f38a7676a7abbf Mon Sep 17 00:00:00 2001
From: classabbyamp <void@placeviolette.net>
Date: Mon, 29 Aug 2022 14:37:27 -0400
Subject: [PATCH] common/xbps-src/shutils/update_check.sh: ignore pkgs without
 distfiles

unless they use the update override file
---
 common/xbps-src/shutils/update_check.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/common/xbps-src/shutils/update_check.sh b/common/xbps-src/shutils/update_check.sh
index ec53ed9f38e6..dfac386347ba 100644
--- a/common/xbps-src/shutils/update_check.sh
+++ b/common/xbps-src/shutils/update_check.sh
@@ -13,6 +13,11 @@ update_check() {
         if [ "$XBPS_UPDATE_CHECK_VERBOSE" ]; then
             echo "using $XBPS_TARGET_PKG/update overrides" 1>&2
         fi
+    elif [ -z "$distfiles" ]; then
+        if [ "$XBPS_UPDATE_CHECK_VERBOSE" ]; then
+            echo "NO DISTFILES found for $original_pkgname" 1>&2
+        fi
+        return 0
     fi
 
     if ! type curl >/dev/null 2>&1; then