xhttp_pi: make sure that cfg directory exists during install

modules/xhttp_pi/Makefile

@@ -40,7 +40,9 @@ install-cfg:
 		fi ; \
 	done
 	# provisionning xml framework
-	@$(call try_err, $(INSTALL_TOUCH) $(cfg_prefix)/$(cfg_dir)/pi_framework.xml.sample)
+	@$(call try_err, mkdir -p $(cfg_prefix)/$(cfg_dir))
+	@$(call try_err, $(INSTALL_TOUCH) \
+		$(cfg_prefix)/$(cfg_dir)/pi_framework.xml.sample)
 	@$(call try_err, $(INSTALL_CFG) ../../examples/pi_framework.xml \
 		$(cfg_prefix)/$(cfg_dir)/pi_framework.xml.sample)
 	@if [ -z "${skip_cfg_install}" -a \