busybox: enable flock by default

This is needed for procd init script protection to work.
flock adds 4248 bytes to stripped busybox binary.

Signed-off-by: Roman Yeryomin <roman@advem.lv>

package/utils/busybox/Config-defaults.in

@@ -1497,7 +1497,7 @@ config BUSYBOX_DEFAULT_FINDFS
 	default n
 config BUSYBOX_DEFAULT_FLOCK
 	bool
-	default n
+	default y
 config BUSYBOX_DEFAULT_FDFLUSH
 	bool
 	default n