reduce disk usage during write #872

Job	Run time
cancel-old-build	2s
build-linux (debug, static_lib)	22s
build-win32 (debug, static_lib)	45s
build-linux (debug, shared_lib)	27s
build-darwin (debug, static_lib, x64)	24s
build-win32 (debug, shared_lib)	54s
build-linux (debug, cmd)	37s
test-darwin (debug, arm64)	40s
build-darwin (debug, static_lib, arm64)	29s
build-win32 (debug, cmd)	58s
build-linux (release, static_lib)	1m 5s
test-darwin (debug, x64)	1m 0s
build-darwin (debug, shared_lib, x64)	31s
build-win32 (release, static_lib)	1m 41s
test-darwin (release, arm64)	2m 25s
build-linux (release, shared_lib)	52s
build-darwin (debug, shared_lib, arm64)	30s
build-win32 (release, shared_lib)	1m 29s
test-darwin (release, x64)	57s
build-linux (release, cmd)	53s
build-darwin (debug, cmd, x64)	3m 11s
build-win32 (release, cmd)	1m 28s
build-darwin (debug, cmd, arm64)	2m 44s
build-darwin (release, static_lib, x64)	1m 32s
test-linux (debug)	51s
test-win32 (debug)	1m 24s
build-darwin (release, static_lib, arm64)	1m 21s
test-linux (release)	1m 1s
test-win32 (release)	1m 16s
build-darwin (release, shared_lib, x64)	3m 4s
build-darwin (release, shared_lib, arm64)	1m 0s
build-darwin (release, cmd, x64)	1m 19s
build-darwin (release, cmd, arm64)	53s
dist-linux	15s
dist-win32	44s
dist-darwin (x64)	45s
dist-darwin (arm64)	42s
	40m 31s

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