sdl: prepare for emscripten port #525

Job	Run time
macosx	5m 17s
ios	2m 22s
android	5m 3s
linux - debian:bookworm \|	2m 30s
msvs	4m 29s
linux - debian:bookworm \| arm32	14m 32s
msys2 \| mingw32	2m 25s
sanitizer - debian:bookworm \|	2m 37s
msys2 \| mingw64	2m 24s
linux - debian:bookworm \| arm64	4m 18s
sanitizer - debian:bookworm \| arm32	15m 17s
sanitizer - debian:bookworm \| arm64	3m 49s
linux - ubuntu:noble \|	2m 18s
linux - igagis/raspbian:bookworm \| arm32	9m 34s
	1h 16m 55s

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