reduce disk usage during write #873

Job	Run time
cancel-old-build	3s
build-darwin (debug, static_lib, x64)	36s
build-darwin (debug, static_lib, arm64)	27s
build-darwin (debug, shared_lib, x64)	50s
build-darwin (debug, shared_lib, arm64)	31s
build-darwin (debug, cmd, x64)	39s
test-win32 (debug)	1m 6s
build-win32 (debug, static_lib)	45s
build-darwin (debug, cmd, arm64)	56s
test-win32 (release)	1m 37s
test-linux (debug)	40s
build-win32 (debug, shared_lib)	55s
build-darwin (release, static_lib, x64)	1m 3s
test-linux (release)	57s
build-win32 (debug, cmd)	50s
build-darwin (release, static_lib, arm64)	59s
build-win32 (release, static_lib)	1m 41s
build-linux (debug, static_lib)	32s
build-darwin (release, shared_lib, x64)	1m 36s
build-win32 (release, shared_lib)	1m 33s
build-darwin (release, shared_lib, arm64)	1m 33s
build-linux (debug, shared_lib)	38s
build-win32 (release, cmd)	1m 2s
build-linux (debug, cmd)	36s
build-darwin (release, cmd, x64)	55s
build-linux (release, static_lib)	1m 7s
build-darwin (release, cmd, arm64)	55s
test-darwin (debug, arm64)	35s
build-linux (release, shared_lib)	55s
test-darwin (debug, x64)	1m 5s
build-linux (release, cmd)	52s
test-darwin (release, arm64)	52s
test-darwin (release, x64)	59s
dist-win32	41s
dist-linux	15s
dist-darwin (x64)	41s
dist-darwin (arm64)	1m 12s
	33m 9s

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