Generated code tweaks to satisfy next-js bundler
Eliminated parts of emscripten generated code which lead next bundler to fail while processing (runtime dead) dynamic imports specific to nodejs environment.
Related to https://github.com/emscripten-core/emscripten/issues/19886
Probably best solution would be to change emscripten code generator to skip file processing when SINGLE_FILE is enabled (and wasm code inlined as string variable) like also replace require with await import(...)