build: Add support for validating appdata versions

This will avoid old dates from being mentioned in the appdata file, as
happened in evince.

This requires a version of appstream-util with the get-latest-version
command:
hughsie/appstream-glib#468

See https://gitlab.gnome.org/GNOME/evince/-/issues/1950

check-news.sh

@@ -63,6 +63,23 @@ check_version()
 	esac
 }
 
+has_verify_latest_version()
+{
+	appstream-util 2>&1 | grep -q get-latest-version
+	return $?
+}
+
+verify_latest_version()
+{
+	VERSION=$1
+	FILE=$SRC_ROOT/"$2"
+	LATEST_VERSION=`appstream-util get-latest-version "$FILE" | tr -d '\d'`
+	if [ "$LATEST_VERSION" != "$VERSION" ] ; then
+		echo "Expected latest version $VERSION in $FILE, got $LATEST_VERSION"
+		exit 1
+	fi
+}
+
 SRC_ROOT=${MESON_DIST_ROOT:-"./"}
 
 if [ $# -lt 1 ] ; then usage ; fi
@@ -76,6 +93,14 @@ if [ $# -eq 0 ] ; then
 fi
 
 for i in $@ ; do
+	case "$i" in
+	*"metainfo"*)
+		if has_verify_latest_version ; then
+			verify_latest_version $VERSION "$i"
+		fi
+		;;
+	esac
+
 	check_version $VERSION "$i"
 done
 

meson.build

@@ -537,7 +537,7 @@ if is_stable
     find_program('check-news.sh').full_path(),
     '@0@'.format(meson.project_version()),
     'NEWS',
-    'org.gnome.Evince.appdata.xml.in'
+    'org.gnome.Evince.metainfo.xml.in'
   )
 else
   meson.add_dist_script(