Change thread functions to void return type (#3130) #1090

Job	Run time
prepare	15s
prepare-static-dependencies	20s
build-macos (macos-26-intel-cross-compile-static-link)	2m 20s
build-macos (macos-15-intel)	2m 19s
build-macos (macos-26-arm)	1m 15s
build-windows (windows-x86-sse2)	3m 28s
build-macos (macos-26-arm-static-link)	1m 52s
build-linux (ubuntu-22)	2m 19s
build-windows (windows-2025)	4m 34s
build-windows (windows-x64-no-simd)	3m 43s
build-linux (ubuntu-static-link)	3m 10s
build-linux (ubuntu-24)	1m 52s
build-windows (windows-x64-avx2)	3m 36s
build-windows (windows-arm64)	4m 7s
build-linux (ubuntu-arm-static-link)	2m 39s
	37m 49s

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