abuild: avoid shell splitting when packing metafiles

abuild.in

@@ -1218,7 +1218,7 @@ prepare_metafiles() {
 		chmod +x "$controldir/$script"
 		metafiles="$metafiles $script"
 	done
-	echo $metafiles | tr ' ' '\n' > "$controldir"/.metafiles
+	printf %s "$metafiles" | tr ' ' '\0' > "$controldir"/.metafiles
 }
 
 prepare_trace_rpaths() {
@@ -1843,11 +1843,12 @@ create_apks() {
 
 		# control.tar.gz
 		cd "$dir"
-		tar \
+		cat "$dir"/.metafiles | tar \
 			--format=posix \
 			--pax-option=exthdr.name=%d/PaxHeaders/%f,atime:=0,ctime:=0 \
 			--mtime="@${SOURCE_DATE_EPOCH}" \
-			-f - -c $(cat "$dir"/.metafiles) | abuild-tar --cut \
+			--no-recursion --null -T - \
+			-f - -c | abuild-tar --cut \
 			| $gzip -n -9 > control.tar.gz
 		abuild-sign -q control.tar.gz || exit 1