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Update nscplugin, sbt-scala-native, ... to 0.4.17 #259

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Run time

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Job	Run time
build (8)	3m 4s
build (11)	3m 17s
build (17)	3m 40s
testScripted (1of2)	2m 36s
testScripted (2of2)	2m 51s
testIntegration	1m 27s
testFunctional (2.11)	1m 50s
testFunctional (2.12)	2m 19s
testFunctional (2.13)	1m 54s
testFunctional (3)	1m 58s
	24m 56s