cd: do not install regular ubuntu dependencies on special targets #73

Job	Run time
Building macos-slim	3m 4s
Building macos-default	3m 5s
Building macos-full	3m 4s
Building linux-slim	3m 4s
Building linux-default	3m 4s
Building linux-full	3m 4s
Building linux-armhf-slim	3m 2s
Building linux-armhf-default	3m 1s
Building linux-armhf-full	3m 4s
Building linux-armv6-slim	3m 4s
release	0s
	30m 36s

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