Don't attempt to build the bundled dtc as we're not going to use it,
and it would require dtc[python] too anyway.
--- a/Makefile
+++ b/Makefile
@@ -594,7 +594,7 @@ else
 # Carefully list dependencies so we do not try to build scripts twice
 # in parallel
 PHONY += scripts
-scripts: scripts_basic scripts_dtc include/config/auto.conf
+scripts: scripts_basic include/config/auto.conf
 	$(Q)$(MAKE) $(build)=$(@)
 
 ifeq ($(dot-config),1)
@@ -2057,11 +2057,11 @@ endif
 
 ifneq ($(dtstree),)
 
-%.dtb: prepare3 scripts_dtc
+%.dtb: prepare3
 	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
 
 PHONY += dtbs dtbs_install
-dtbs: prepare3 scripts_dtc
+dtbs: prepare3
 	$(Q)$(MAKE) $(build)=$(dtstree)
 
 dtbs_install: