[PR PATCH] gnome-tour: fix cross building

[oreo639 <oreo639@users.noreply.github.com>]

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There is a new pull request by oreo639 against master on the void-packages repository

https://github.com/oreo639/void-packages gtour
https://github.com/void-linux/void-packages/pull/37920

gnome-tour: fix cross building
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#### Testing the changes
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A patch file from https://github.com/void-linux/void-packages/pull/37920.patch is attached

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From 63ff85ab84c36ba8212b6b6b17e77169dd54cccd Mon Sep 17 00:00:00 2001
From: oreo639 <31916379+Oreo639@users.noreply.github.com>
Date: Thu, 7 Jul 2022 18:29:01 -0700
Subject: [PATCH] gnome-tour: fix cross building

---
 srcpkgs/gnome-tour/template | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/srcpkgs/gnome-tour/template b/srcpkgs/gnome-tour/template
index adb289c3e0d4..0fcd74daf2bd 100644
--- a/srcpkgs/gnome-tour/template
+++ b/srcpkgs/gnome-tour/template
@@ -4,8 +4,9 @@ version=42.0
 revision=1
 build_style=meson
 build_helper=rust
-hostmakedepends="pkg-config cargo rust glib-devel gettext desktop-file-utils"
-makedepends="gtk4-devel libadwaita-devel libglib-devel"
+hostmakedepends="pkg-config cargo glib-devel gettext
+ desktop-file-utils gtk-update-icon-cache"
+makedepends="gtk4-devel libadwaita-devel libglib-devel rust-std"
 short_desc="GNOME Tour & Greeter"
 maintainer="oreo639 <oreo6391@gmail.com>"
 license="GPL-3.0-or-later"
@@ -13,3 +14,9 @@ homepage="https://gitlab.gnome.org/GNOME/gnome-tour/"
 changelog="https://gitlab.gnome.org/GNOME/gnome-tour/-/raw/master/NEWS"
 distfiles="${GNOME_SITE}/${pkgname}/${version%.*}/${pkgname}-${version}.tar.xz"
 checksum=fcf1ac689057da86596970ec3da8355521c0a72e95063eb059d5fee4dea82f4f
+
+post_patch() {
+	[ -z "$CROSS_BUILD" ] && return 0
+	vsed -i src/meson.build \
+		 -e "s%rust_target /%'${RUST_TARGET}' / rust_target /%"
+}