Merge remote-tracking branch 'origin/fix-_exit' into incoming ; versi…

…on 1.37.15

1.37.13 ; binaryen version 33

1.37.10 ; update binaryen tag to 32

Bump version to 1.37.9

Bump Emscripten version to 1.37.8 to recompile libc-mt which changed …

…struct layout for mutex structure.