Updated the NEWS file for 1.2.6 changes.

This commit was SVN r17669.

NEWS

@@ -94,6 +94,11 @@ Trunk (not on release branches yet)
 
 1.2.6 (not released yet, if ever)
 -----
+- Sanitised some #define macros used in mpi.h to avoid compiler warnings
+  caused by MPI programs built with different autoconf versions.
+  Thanks to Ben Allan for reporting the problem, and thanks to
+  Brian Barrett for the fix. See ticket #1220.
+- Some man page fixes from the Debian maintainers. See ticket #1219.
 - Made the openib BTL a bit more resillient in the face of driver
   errors.  See ticket #1217.
 - Fixed F90 interface for MPI_CART_CREATE.  See ticket #1208.