reduce disk usage during write #863

Job	Run time
cancel-old-build	3s
build-linux (debug, static_lib)	24s
build-win32 (debug, static_lib)	42s
build-linux (debug, shared_lib)	23s
build-darwin (debug, static_lib, x64)	2s
build-win32 (debug, shared_lib)	1m 3s
build-linux (debug, cmd)	35s
test-darwin (debug, arm64)	51s
build-darwin (debug, static_lib, arm64)	31s
build-win32 (debug, cmd)	38s
build-linux (release, static_lib)	40s
test-darwin (debug, x64)	39s
build-darwin (debug, shared_lib, x64)	33s
build-win32 (release, static_lib)	2m 9s
build-linux (release, shared_lib)	41s
test-darwin (release, arm64)	45s
build-darwin (debug, shared_lib, arm64)	35s
build-win32 (release, shared_lib)	1m 51s
build-linux (release, cmd)	40s
test-darwin (release, x64)	43s
build-darwin (debug, cmd, x64)	49s
build-win32 (release, cmd)	1m 44s
build-darwin (debug, cmd, arm64)	51s
test-linux (debug)	34s
build-darwin (release, static_lib, x64)	1s
test-win32 (debug)	1m 36s
test-linux (release)	42s
build-darwin (release, static_lib, arm64)	1s
test-win32 (release)	1m 58s
build-darwin (release, shared_lib, x64)	1s
build-darwin (release, shared_lib, arm64)	1s
build-darwin (release, cmd, x64)	1s
build-darwin (release, cmd, arm64)	1s
dist-linux	0s
dist-darwin	0s
dist-win32	23s
	23m 11s

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