Update menuconfig items with approximate applet sizes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/last.c b/util-linux/last.c
index b3f125c..5bce857 100644
--- a/util-linux/last.c
+++ b/util-linux/last.c
@@ -7,7 +7,7 @@
  * Licensed under GPLv2, see file LICENSE in this source tree.
  */
 //config:config LAST
-//config:	bool "last"
+//config:	bool "last (6.2 kb)"
 //config:	default y
 //config:	depends on FEATURE_WTMP
 //config:	help