test/tests/dash_c.py: flush output to avoid nondeterminism

test/tests/dash_c.py

@@ -7,7 +7,10 @@ with open('/dev/null')as ignore:
     # We don't (yet?) require exact stderr or return code compatibility w/
     # python. So we just check that we succeed or fail as appropriate.
     def run(args):
-        print subprocess.call([me] + args, stderr=ignore)
+        code = 0 == subprocess.call([me] + args, stderr=ignore)
+        sys.stdout.flush()
+        print code
+        sys.stdout.flush()
 
     run(["-c", "print 2 + 2"])
     run(["-c", "import sys; print sys.argv", "hello", "world"])