Only use SELinux tools from toolbox if not in busybox

If busybox has SELinux support, we don't need toolbox to provide SELinux
specific tools. Check busybox for restorecon to see if SELinux support
is present and then adjust the tools built by toolbox based on this.

Change-Id: I30a2b036b97ac3e26510d5e0498c52d7a8af36e1
diff --git a/toolbox/Android.mk b/toolbox/Android.mk
index 7386897..053660a 100644
--- a/toolbox/Android.mk
+++ b/toolbox/Android.mk
@@ -7,8 +7,10 @@
 	getprop \
 	setprop
 
+# If busybox does not have SELinux support, provide these tools with toolbox.
+# Note that RECOVERY_BUSYBOX_TOOLS will be empty if TW_USE_TOOLBOX == true.
 ifeq ($(TWHAVE_SELINUX), true)
-	TOOLS += \
+	TOOLS_FOR_SELINUX := \
 		ls \
 		getenforce \
 		setenforce \
@@ -18,6 +20,7 @@
 		getsebool \
 		setsebool \
 		load_policy
+	TOOLS += $(filter-out $(RECOVERY_BUSYBOX_TOOLS), $(TOOLS_FOR_SELINUX))
 endif
 
 ifeq ($(TW_USE_TOOLBOX), true)