Update to emscripten 2.0.34

Update to emscripten 2.0.33

Capture the current state of the emscripten musl fork

This snapshot was taken from emscripten 2.0.12 which was
based on musl v1.1.15.

release 1.2.2

release 1.2.1

release 1.2.0

release 1.1.24

release 1.1.23

release 1.1.22

release 1.1.21