Add selinux status functions from upstream libselinux.

These functions allow programs to check whether there has
been a change to the SELinux status without needing to poll a netlink socket.

Change-Id: Ic7f310d69a7c420e48fbc974000cf4a5b9ab4a3b
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
diff --git a/Android.mk b/Android.mk
index 14c9aab..6423177 100644
--- a/Android.mk
+++ b/Android.mk
@@ -26,7 +26,9 @@
 	src/avc_internal.c \
 	src/avc_sidtab.c \
 	src/get_initial_context.c \
-	src/checkAccess.c
+	src/checkAccess.c \
+	src/sestatus.c \
+	src/deny_unknown.c
 
 common_HOST_FILES := \
 	src/callbacks.c \