Merged requested to merge ZUUL42:Werror_mst into develop
Created by: ZUUL42
This sets -Werror for MueLu, Stokhos, & Tempus.
Motivation and Context
This is work toward #3178 turning Werror on for all packages in the GCC 7.2.0 PR build.
Allowed by work from Issue/PR #4513 (closed)/#4543 #4515 (closed)/#4552 & #4510 (closed)/#4522.
My commit messages mention the appropriate GitHub issue numbers.
My code follows the code style of the affected package(s).
I have read the code contribution guidelines for this project.
All new and existing tests passed.
No new compiler warnings were introduced.