build dispatch failed issue for missing pthread_workqueue.h and its solution on Linux about express

[dileping]

@learningpro Thanks for putting it here. Looks like Apple has got rid of internal libpwq dependency and moved to a shared library (good thing, btw, as we are using it as well in ExecutionContext).

Would you consider changing the docs, please? Help is highly appreciated as we are currently focused on new 0.4 release and don't want to loose concentration.

[learningpro]

@dileping OK, I will try to make a PR, thanks for your hard working on 0.4 release and I cannot wait to see it ^_^

[dileping]

@learningpro Thanks a lot for kind words. We are pushing very hard toward the release. Your help is very appreciated. I answered you on the PR thread as well.

[learningpro]

I'm happy to make some contribution