Set Werror for ML

Created by: ZUUL42

@trilinos/framework

Description

Sets Werror for ML in the GC 7.2.0 PR build.

Motivation and Context

This is work toward #3178, setting -Werror for all packages.

Allowed by work from Issue #4512 (closed) & PR #4625.

Checklist

• My commit messages mention the appropriate GitHub issue numbers.
• My code follows the code style of the affected package(s).
• All new and existing tests passed.
• No new compiler warnings were introduced.