A minimal external tree for Buildroot

Change-Id: I6fd89c1bd9e66e7781f9dc623f19739cda6ae6a3
diff --git a/external.mk b/external.mk
new file mode 100644
index 0000000..683e889
--- /dev/null
+++ b/external.mk
@@ -0,0 +1 @@
+include $(sort $(wildcard $(BR2_EXTERNAL_CZECHLIGHT_PATH)/package/*/*.mk))