build.sh: dont build everything while detecting the targets...

build.sh

@@ -96,7 +96,8 @@ done
 
 if [ "$auto_targets" = "1" ]; then
 	# detect available targets
-	targets="$(make | tee /dev/stderr | awk '$1 == "*" {print $2}' | sort | xargs)"
+	make
+	targets="$(make | awk '$1 == "*" {print $2}' | sort | xargs)"
 else
 	# if a list of build targets has been supplied, only build those
 	targets="$(echo "${build_targets:-$targets}" | sed -e 's_,_ _g')"