obs/re6st: pin version of buildout during boostrap

This is to prevent the "The 'wheel' distribution was not found" error

obs/re6st/make.py

@@ -99,7 +99,8 @@ def bootstrap(task):
             check_output((sys.executable, "-S", "-",
                 # XXX: By starting with an older version,
                 #      we'll have the wanted version in cache.
-                "--setuptools-version", "40.8.0"), input=bootstrap)
+                "--setuptools-version", "40.8.0",
+                "--buildout-version", "2.13.8"), input=bootstrap)
             no_wheel()
             check_call(("bin/buildout", "buildout:extensions=",
                 "buildout:newest=true", "buildout:parts=python-bootstrap"))