Patch #1504073: Fix tarfile.open() for mode "r" with a fileobj argument.

Will backport to 2.5.
diff --git a/Misc/NEWS b/Misc/NEWS
index 363320b..ba882ef 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -103,6 +103,8 @@
 Library
 -------
 
+- Patch #1504073: Fix tarfile.open() for mode "r" with a fileobj argument.
+
 - Patch #1182394 from Shane Holloway: speed up HMAC.hexdigest.
 
 - Patch #1262036: Prevent TarFiles from being added to themselves under