Make c10 tests compilable with -Werror

[malfet]

Stack from ghstack:

• [CI] Build clang configs with -Werror #69712 [CI] Build clang configs with -Werror
• Make c10 tests compilable with -Werror #69711 Make c10 tests compilable with -Werror
• Suppress common warnings when building by clang #69710 Suppress common warnings when building by clang
• [c2] Remove unused private fields #69709 [c2] Remove unused private fields

Differential Revision: D32997005

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[malfet]

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