Mike Stump named as Objective-C/Objective-C++ maintainer

[Joe Buck]

The GCC Steering Committee has appointed Mike Stump as maintainer
of the Objective-C and Objective-C++ front ends.  Mike will work
with Ziemowit Laski, who remains a maintainer of these front ends
as well.  Thanks, Mike, for volunteering for this job.

Also, Mike, please add yourself to the MAINTAINERS file in the
appropriate place.

Joe