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gh-95853: Improve WASM build script (GH-96389)

- pre-build Emscripten ports and system libraries
- check for broken EMSDK versions
- use EMSDK's node for wasm32-emscripten
- warn when PKG_CONFIG_PATH is set
- add support level information
C
Christian Heimes committed
2eb9008d726e15838a2c8b36c8bd0bf67f229458
Parent: d0b3d23
Committed by GitHub <noreply@github.com> on 8/30/2022, 5:56:26 AM