Add missing new file.

theano/misc/windows.py

+import os
+import subprocess
+
+
+def call_subprocess_Popen(command, **params):
+    """
+    Utility function to work around windows behavior that open windows
+    """
+    startupinfo = None
+    if os.name == 'nt':
+        startupinfo = subprocess.STARTUPINFO()
+        try:
+            startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
+        except AttributeError:
+            startupinfo.dwFlags |= subprocess._subprocess.STARTF_USESHOWWINDOW
+    proc = subprocess.Popen(command, startupinfo=startupinfo, **params)
+    return proc