runlevel/wall: depend on utmp feature

These utils use funcs from utmp.h (like setutent), but utmp.h is only
included when FEATURE_UTMP is enabled.  Otherwise we get build failures
due to missing defines/prototypes.  So depend on this option.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/miscutils/Config.src b/miscutils/Config.src
index da52e14..b5866bb 100644
--- a/miscutils/Config.src
+++ b/miscutils/Config.src
@@ -583,6 +583,7 @@
 config RUNLEVEL
 	bool "runlevel"
 	default y
+	depends on FEATURE_UTMP
 	help
 	  find the current and previous system runlevel.
 
@@ -658,6 +659,7 @@
 config WALL
 	bool "wall"
 	default y
+	depends on FEATURE_UTMP
 	help
 	  Write a message to all users that are logged in.