icc_profile: Decode curve type #3390

Job	Run time
lint	36s
test (ubuntu-latest, test, 386, 0)	2m 44s
test (windows-latest, test, amd64, 0)	3m 2s
test (ubuntu-latest, test-race, amd64, 1)	7m 55s
test (macos-latest, test, amd64, 0)	3m 39s
	17m 56s

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