emscripten: fix undefined symbol errors in non-threaded builds #5773
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Description
Changes the framebuffer/cursor proxying code to use
MAIN_THREAD_EM_ASM
instead ofemscripten_sync_run_in_main_runtime_thread
with a function wrapping theEM_ASM
. This is how everything else was handled.Fixes this error
error: undefined symbol: emscripten_sync_run_in_main_runtime_thread_
caused by the proxying changes (caught while trying to update Emscripten to the latest release(emscripten-core/emscripten#16916)).