emscripten: Update deprecated calls to EM_ASM*. `EM_ASM_` and `EM_ASM_INT_V` are calls that have been deprecated for a long time. Since the return value isn't used for the call to `EM_ASM_`, it can be replaced with `EM_ASM`. `EM_ASM_INT_V` is now (for the last few years) `EM_ASM_INT`. (cherry picked from commit a8e89f2567b9069c919f9b21996e0a46cd4bb679)