testing/emscripten: upgrade to 1.38.34
Currently available version is from 2017.
Also, the homepage has changed to https://emscripten.org, and the source has also moved to https://github.com/emscripten-core/emscripten.
I reached out to the maintainer, but I never received a response.
I would be willing to submit a patch, I just don’t want to duplicate effort.
(from redmine: issue id 10549, created on 2019-06-10)
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