Roll engine d80c1de7b53a..8176f4d3c467 (3 commits) (#22390)

https://github.com/flutter/engine/compare/d80c1de7b53a...8176f4d3c467

git log d80c1de7b53a..8176f4d3c467 --no-merges --oneline
8176f4d3c Roll buildroot to 96d2493887daabe6877142caa8504a2f964b0e7e (flutter/engine#6364)
27f77cbef Document that all MethodChannel callbacks must be called on the main thread. (flutter/engine#6245)
e6c173392 Script to verify exported symbols on release binaries (flutter/engine#6363)


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bin/internal/engine.version

-d80c1de7b53af81a0b4385eb3f13de1ef77f0d2d
+8176f4d3c467ee5d261ba09f6c9dfa6853f6744d