pthreads and webaudio doesn't work together

Please include the following in your bug report:

**Version of emscripten/emsdk:**
Please include the output `emcc -v` here
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.23 (5ae63ce7dd955df449cb419bfe5afc51d1bd57f2)
clang version 16.0.0 (https://github.com/llvm/llvm-project 8b587113b746f31b63fd6473083df78cef30a72e)
Target: wasm32-unknown-emscripten
Thread model: posix
InstalledDir: /home/terop/cvs/emscripten/emsdk/upstream/bin

**Failing command line in full:**
If this is compile or link-time failure please include the full failing command
along with its entire output.

**Full link command and output with `-v` appended:**
Even for runtime issues it helps a lot if you can include the full link command.
Adding `-v` to the link command will show all of the sub-commands run which
can help us diagnose your issue.

The problem is with line:
SDL.audioContext['decodeAudioData'](arrayBuffer, onDecodeComplete);
in the generated .js file. the arraybuffer is sharedArrayBuffer and not ordinary arraybuffer and thus the decodeAudioData fails.
When arraybuffer is sharedArrayBuffer the line should do something more useful than crashing.