
Fixes a couple issues in the skwasm build rules: * `DEMANGLE_SUPPORT` is deprecated in emscripten, so just remove it. * `sSHARED_MEMORY=1` needs to be added to the cflags so that emscripten appends the proper feature flags (`-matomics` and `-mbulk-memory`) when doing the compile so that the flags match the linking step.
Flutter Engine
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