Stop rebuilding `sdk-lints` all the time (#2861)

I noticed `sdk-lints` was getting recompiled just about every time I ran
`git commit` as part of the pre-commit hooks. It looks like a compiler
flag was added to the `ExecRustBuildTool` task type that isn't actually
used by any tools. Removing it should eliminate compiler flag conflicts
between the gradle targets and pre-commit.

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