[PR PATCH] common/travis/xpkgdiff.sh: fix on cross build

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

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

https://github.com/Chocimier/void-packages-org xpkgdiff
https://github.com/void-linux/void-packages/pull/41703

common/travis/xpkgdiff.sh: fix on cross build
xbps-query in this script needs a target architecture specified

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#### Testing the changes
- I tested the changes in this PR: 
  - https://github.com/void-linux/void-packages/actions/runs/3940693091/jobs/6742126472#step:9:9
  - https://github.com/Chocimier/void-packages-org/actions/runs/3943107347/jobs/6747551877#step:9:9

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A patch file from https://github.com/void-linux/void-packages/pull/41703.patch is attached

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From 83e37ebda2c77a3065142a4ff3c7d138b020b8c0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Piotr=20W=C3=B3jcik?= <chocimier@tlen.pl>
Date: Tue, 17 Jan 2023 21:34:56 +0100
Subject: [PATCH] common/travis/xpkgdiff.sh: fix on cross build

xbps-query in this script needs a target architecture specified
---
 common/travis/xpkgdiff.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/travis/xpkgdiff.sh b/common/travis/xpkgdiff.sh
index 7caabe4b0b71..6450a6c0889b 100755
--- a/common/travis/xpkgdiff.sh
+++ b/common/travis/xpkgdiff.sh
@@ -2,7 +2,7 @@
 #
 # xpkgdiff.sh
 
-export XBPS_DISTDIR=/hostrepo XBPS_HOSTDIR="$HOME/hostdir"
+export XBPS_TARGET_ARCH="$2" XBPS_DISTDIR=/hostrepo XBPS_HOSTDIR="$HOME/hostdir"
 export DIFF='diff --unified=0 --report-identical-files --suppress-common-lines
  --color=always --label REPO --label BUILT'
 ARGS="-a $2 -R https://repo-ci.voidlinux.org/current"