[svn r63301] don't open the anyway unused stdin, this can (at last on python 2.4 on Mac) leave open pipes in the process

--HG--
branch : trunk

py/process/cmdexec.py

@@ -32,7 +32,7 @@ def posix_exec_cmd(cmd):
     import errno
 
     #print "execing", cmd
-    child = Popen(cmd, shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE,
+    child = Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE,
                                                                 close_fds=True)
     stdin, stdout, stderr = child.stdin, child.stdout, child.stderr