[release/8.0-staging] Fix inadvertently upgrading compiler warnings to errors

[akoeplinger]

Backport of #114323 to release/9.0-staging.

Don't inadvertently upgrade compiler warnings to errors in libs.native.

Customer Impact

• Customer reported
• Found internally

Building with a newer compilers can introduce new warnings, breaking the build unintentionally even though we explicitly tried to avoid this by disabling this behavior in release branches. This could especially affect source-build partners which don't use our build infrastructure.

Regression

• Yes
• No

No, we just forgot to apply this fix to the libs.native subset. It was there for coreclr and mono runtime builds already.

Testing

CI testing.

Risk

Low, this is a build-only change.

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Files not reviewed (1)

• src/native/libs/build-native.proj: Language not supported

[akoeplinger]

Applying servicing-approved, infrastructure-only change required to build with newer compilers, tell mode.

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