using shared_module with emscripten

[mmomtchev]

I see that when I am building on Windows, shared_module automagically knows that this step will produce two files - a name_prefix.name.name_suffix and a name_prefix.name.lib. emscripten will usually produce at least two files - name_prefix.name.name_suffix and name_prefix.name.wasm - plus an additional name_prefix.name.worker .name_suffix when multithreading is enabled. Is there any way to replicate the Windows behavior with it? I am currently using a dummy custom_target to handle installation of these.