Add dependencies on all the makefiles.

This should help prevent broken builds next time I'm messing with
assembler/compiler/linker flags...

Change-Id: I30f15a3ce3c3f3c60cad7bc59aaba9f42d792224
diff --git a/linker/Android.mk b/linker/Android.mk
index b519976..99618f5 100644
--- a/linker/Android.mk
+++ b/linker/Android.mk
@@ -45,6 +45,7 @@
 endif
 
 LOCAL_MODULE:= linker
+LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
 LOCAL_STATIC_LIBRARIES := libc_nomalloc