Fix segfault issue in docker by patching salt-call

This patch updates the threading stack size to 8MB.
see: docker-library/python#211 (comment)

Makefile

@@ -37,6 +37,7 @@ pull:
 .tmp/thin.tgz: ${THIN_RM}
 	wget -O .tmp/thin.tgz https://github.com/bbinet/salt/releases/download/${THIN_VERSION}/thin.tgz
 	rm -fr .tmp/thin && mkdir -p .tmp/thin && tar zxvf .tmp/thin.tgz -C .tmp/thin/
+	sed -i '2iimport threading; threading.stack_size(8*1024*1024)' .tmp/thin/salt-call
 thin: .tmp/thin.tgz .tmp/etc/salt/minion_id
 thin_rm:
 	rm -f .tmp/thin.tgz