Swift

Fixed minor build warnings. (Removed unused references/dead code.) #346

Job	Run time
test_other_platforms (platform=iOS Simulator,name=iPhone 15,OS=17.0)	13m 6s
build_watch_os_mac_catalyst (platform=watchOS Simulator,name=Apple Watch Series 8 (45mm),OS=10.0)	1m 42s
test_linux (swift:5.6)	1m 0s
test_other_platforms (platform=tvOS Simulator,name=Apple TV,OS=17.0)	14m 6s
build_watch_os_mac_catalyst (platform=macOS,variant=Mac Catalyst)	1m 55s
test_linux (swift:5.7)	4m 54s
test_linux (swift:5.8)	4m 24s
test_macOS	4m 19s
test_linux (swift:5.9)	5m 2s
test_linux (swift:5.10)	5m 49s
build_spotify_api_server	3m 2s
	59m 19s

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