[libclc] Move myself to the list of inactive maintainers

Change my email address in the process. I will not be able to keep up
maintainership duties on this project in the future.

Adding the wording on the inactive maintainers section myself like this
feels self-aggrandizing but was copied from other LLVM projects.

Author: frasercrmck

libclc/Maintainers.md

@@ -10,8 +10,14 @@ The following people are the active maintainers for the project. Please reach
 out to them for code reviews, questions about their area of expertise, or other
 assistance.
 
-Fraser Cormack \
-fraser@codeplay.com (email), [frasercrmck](https://github.com/frasercrmck) (GitHub)
-
 Tom Stellard \
 tstellar@redhat.com (email), [tstellar](https://github.com/tstellar) (GitHub)
+
+## Inactive Maintainers
+
+The following people have graciously spent time performing maintainership
+responsibilities but are no longer active in that role. Thank you for all your
+help with the success of the project!
+
+Fraser Cormack \
+frasercrmck@pm.me (email), [frasercrmck](https://github.com/frasercrmck) (GitHub)