[PATCH 4 of 4] make: add Debian 9 (Stretch) docker target

[Anton Shestakov]

# HG changeset patch
# User Anton Shestakov <av6 at dwimlabs.net>
# Date 1498196021 -28800
#      Fri Jun 23 13:33:41 2017 +0800
# Node ID c123ce14d4518bae8baab87a6e8e1460f27e6257
# Parent  198409fdaca73f5cc176c3bce6b3992b47e83012
make: add Debian 9 (Stretch) docker target

diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -210,6 +210,10 @@ docker-debian-jessie: contrib/docker/deb
 	mkdir -p packages/debian-jessie
 	contrib/dockerdeb debian jessie
 
+docker-debian-stretch: contrib/docker/debian-stretch
+	mkdir -p packages/debian-stretch
+	contrib/dockerdeb debian stretch
+
 contrib/docker/ubuntu-%: contrib/docker/ubuntu.template
 	sed "s/__CODENAME__/$*/" $< > $@
 
@@ -300,7 +304,7 @@ linux-wheels-i686:
 .PHONY: help all local build doc cleanbutpackages clean install install-bin \
 	install-doc install-home install-home-bin install-home-doc \
 	dist dist-notests check tests check-code update-pot \
-	osx deb ppa docker-debian-jessie \
+	osx deb ppa docker-debian-jessie docker-debian-stretch \
 	docker-ubuntu-trusty docker-ubuntu-trusty-ppa \
 	docker-ubuntu-xenial docker-ubuntu-xenial-ppa \
 	docker-ubuntu-yakkety docker-ubuntu-yakkety-ppa \