Issue #12326: sys.platform is now always 'linux2' on Linux

Even if Python is compiled on Linux 3.
diff --git a/Misc/NEWS b/Misc/NEWS
index fe85823..48ef326 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,10 @@
 Core and Builtins
 -----------------
 
+- Issue #12326: sys.platform is now always 'linux2' on Linux, even if Python
+  is compiled on Linux 3.
+
+
 Library
 -------