run-tests.py: don't use console for stdin when running in debug mode

Tests would wait for input instead of using non-interactive mode.

tests/run-tests.py

@@ -749,7 +749,8 b' def run(cmd, wd, options, replacements):'
     Return a tuple (exitcode, output).  output is None in debug mode."""
     # TODO: Use subprocess.Popen if we're running on Python 2.4
     if options.debug:
-        proc = subprocess.Popen(cmd, shell=True, cwd=wd)
+        proc = subprocess.Popen(cmd, shell=True, cwd=wd, stdin=subprocess.PIPE)
+        proc.stdin.close()
         ret = proc.wait()
         return (ret, None)