Add filesystem support to Emscripten config #1679

Job	Run time
build-emscripten (emscripten)	3m 54s
build-msys2 (mingw64)	14m 11s
build-msys2 (ucrt64)	14m 10s
build-msys2 (clang64)	9m 53s
build-vs2022 (x64)	1m 15s
build-android (android, armeabi-v7a)	7m 33s
build-android (android, x86_64)	8m 32s
build-vs2022 (ARM64)	1m 17s
build-linux64 (linux64, 64gcc6)	11m 5s
build-android (android, arm64-v8a)	8m 8s
build-ios-tvos (ios, macos)	4m 29s
build-vs2022 (ARM64EC)	1m 8s
rpi-build (aarch64, arm64, aarch64-linux-gnu, 1)	6m 23s
build-ios-tvos (tvos, macos)	4m 38s
rpi-build (armv6l, armhf, arm-linux-gnueabihf, 1)	5m 32s
build-macos (osx, xcode)	3m 36s
build-macos (osx, makefiles)	5m 11s
	1h 50m 55s

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