use _use_static_libraries here again to ensure proper dependency

Change-Id: I04fb35b6eac1c1777e67de9877417cfe7cc5aac8

RepositoryExternal.mk

@@ -1918,7 +1918,7 @@ $(call gb_LinkTarget_set_include,$(1),\
 	-I$(call gb_UnpackedTarball_get_dir,orcus/include) \
 	$$(INCLUDE) \
 )
-$(call gb_LinkTarget_use_static_external_library,$(1),orcus,liborcus)
+$(call gb_LinkTarget_use_static_libraries,$(1),orcus)
 endef
 
 endif # SYSTEM_LIBORCUS

solenv/gbuild/LinkTarget.mk

@@ -745,15 +745,6 @@ $$(foreach lib,$(2),$$(call gb_StaticLibrary_get_headers_target,$$(lib)))
 
 endef
 
-# gb_LinkTarget_use_static_external_library linktarget library externalproject
-define gb_LinkTarget_use_static_external_library
-$(call gb_LinkTarget_get_target,$(1)) : LINKED_STATIC_LIBS += $(2)
-
-$(call gb_LinkTarget_get_target,$(1)) : $(call gb_ExternalProject_get_target,$(3))
-$(call gb_LinkTarget_get_external_headers_target,$(1)) : $(call gb_ExternalProject_get_target,$(3))
-
-endef
-
 define gb_LinkTarget_add_cobject
 $(if $(wildcard $(call gb_CObject_get_source,$(SRCDIR),$(2))),,$(eval $(call gb_Output_error,No such source file $(call gb_CObject_get_source,$(SRCDIR),$(2)))))
 $(call gb_LinkTarget_get_target,$(1)) : COBJECTS += $(2)