[3.14] gh-136229: Remove Platform Emscripten is not supported warning (GH-136230) (#136445)

Updates configure script to identify Emscripten as Tier 3.
(cherry picked from commit 6ea425828540d7a19296183c3410283897767d9a)

Co-authored-by: Hood Chatham <roberthoodchatham@gmail.com>

Miss Islington (bot) committed 9mo ago

e0b9f0721c842a32fb5fd761f2d3e5cd0a568a69

Parent: 9a79c51

Committed by GitHub <noreply@github.com> on 7/9/2025, 2:42:49 AM