free space on windows #221

Job	Run time
build (Release, arm, armv7l, https://downloads.sourceforge.net/project/raspberry-pi-cross-compile...	26m 35s
build (Release, arm, armv6l, https://downloads.sourceforge.net/project/raspberry-pi-cross-compile...	28m 1s
build (Debug, arm, armv6l, https://downloads.sourceforge.net/project/raspberry-pi-cross-compilers...	25m 48s
build (Release, arm64, arm64, aarch64-linux-gnu)	27m 18s
build (Debug, arm64, arm64, aarch64-linux-gnu)	25m 49s
build (Debug, arm, armv7l, https://downloads.sourceforge.net/project/raspberry-pi-cross-compilers...	26m 0s
	2h 39m 31s

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