Build installers

Make sure Fleetspeak client and server binaries are built static. #267

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Run time

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Job	Run time
build-windows	3m 42s
build-test-linux	12m 16s
build-osx	1m 0s
test-osx	5m 21s
test-windows	8m 5s
upload-installers	0s
	30m 24s