Steps to reproduce

1. Compile the engine sources (specifically Impeller) with Clang 21

Expected results

The engine successfully compiles

Actual results

Compilation fails with
../../flutter/impeller/renderer/vertex_descriptor.h:31:11: error: virtual method '~VertexDescriptor' is inside a 'final' class and can never be overridden [-Werror,-Wunnecessary-virtual-specifier

unnecessary-virtual-specifier was added in Clang 21.1.0

Code sample

N/A

Screenshots or Video

Logs

[Paste your logs here]

Flutter Doctor output

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