Swift

Fix `SocketDescriptor.Event.Flags` #146

Job	Run time
macOS (debug)	36s
macOS (debug, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	47s
Android (6.2.3, aarch64)	2m 54s
Android (nightly-6.3, armv7)	3m 25s
macOS (release)	46s
macOS (release, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	1s
Android (6.2.3, x86_64)	2m 56s
Android (nightly-6.3, aarch64)	2m 43s
Android (6.2.3, armv7)	2m 38s
Android (nightly-6.3, x86_64)	3m 5s
Linux (swift:6.1.2, debug)	47s
Linux (swift:6.2.3, release, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	51s
Linux (swift:6.1.2, release)	47s
Linux (swift:6.0.3, debug, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	46s
Linux (swift:6.2.3, release)	1m 4s
Linux (swift:6.1.2, debug, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	46s
Linux (swift:6.0.3, debug)	41s
Linux (swift:6.0.3, release, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	50s
Linux (swift:6.2.3, debug, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	51s
Linux (swift:6.2.3, debug)	53s
Linux (swift:6.1.2, release, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	51s
Linux (swift:6.0.3, release)	46s
	29m 44s

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