NEWS: note that the POWER 7/BE block has been removed.

This is a separate commit from the commit where the block was removed
from configure.ac because this NEWS bullet will almost certainly not
cherry-pick cleanly to release branches.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

NEWS

@@ -69,9 +69,12 @@ Master (not on release branches yet)
   true when using SLURM, as it improves interoperability with SLURM's signal
   propagation tools.  By default it is set to false, except for Cray XC systems.
 - Remove IB XRC support from the OpenIB BTL due to lack of support.
-- Remove support for big endian PowerPC.
-- Remove support for XL compilers older than v13.1
 - Fix rank-by algorithms to properly rank by object and span
+- Disable the POWER 7/BE block in configure.  Note that POWER 7/BE is
+  still not a supported platform, but it is no longer automatically
+  disabled.  See
+  https://github.com/open-mpi/ompi/issues/4349#issuecomment-374970982
+  for more information.
 
 3.0.1 -- March, 2018
 ----------------------