link_type: common overrides 2nd

This is what intermediates-dir-for does (though it also auto-detects
some common classes, which we don't)

Test: build-aosp_arm64.ninja is identical
Change-Id: I4a3efa74e060d82658b856e68318cd92403a6149
diff --git a/core/link_type.mk b/core/link_type.mk
index ed12566..ff525cb 100644
--- a/core/link_type.mk
+++ b/core/link_type.mk
@@ -10,7 +10,7 @@
 #   my_link_deps: the dependencies, in the form of <MODULE_CLASS>:<name>
 #
 
-my_link_prefix := LINK_TYPE:$(call find-idf-prefix,$(my_kind),$(my_host_cross)):$(if $(my_common),$(my_common),_):$(if $(my_2nd_arch_prefix),$(my_2nd_arch_prefix),_)
+my_link_prefix := LINK_TYPE:$(call find-idf-prefix,$(my_kind),$(my_host_cross)):$(if $(my_common),$(my_common):_,_:$(if $(my_2nd_arch_prefix),$(my_2nd_arch_prefix),_))
 link_type := $(my_link_prefix):$(LOCAL_MODULE_CLASS):$(LOCAL_MODULE)
 ALL_LINK_TYPES := $(ALL_LINK_TYPES) $(link_type)
 $(link_type).TYPE := $(my_link_type)