fix 'make build'

Change-Id: I4ec24ffd39f83d9c2d4115e7a06a5eb84a08aae8
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/Makefile b/Makefile
index 8168b94..9782a2d 100644
--- a/Makefile
+++ b/Makefile
@@ -332,7 +332,7 @@
 	@ln -rs $(DIST_FILE).xz $(BR)/vpp-latest.tar.xz
 
 build: $(BR)/.bootstrap.ok
-	$(call make,$(PLATFORM),$(addsuffix -install,$(TARGETS)))
+	$(call make,$(PLATFORM)_debug,$(addsuffix -install,$(TARGETS)))
 
 wipedist:
 	@$(RM) $(BR)/*.tar.xz