Reachability: use NSURLSession for MacOS 10.14 or higher #178

Job	Run time
build (macos-13, release, 'iPhone 15')	21m 43s
build (macos-13, release, 'iPhone 15')	23m 22s
build (macos-13, release, 'iPad Pro (11-inch) (4th generation)')	20m 0s
build (macos-13, release, 'iPad Pro (11-inch) (4th generation)')	20m 0s
build (macos-13, debug, 'iPhone 15')	22m 25s
build (macos-13, debug, 'iPhone 15')	28m 16s
build (macos-13, debug, 'iPad Pro (11-inch) (4th generation)')	23m 21s
build (macos-13, debug, 'iPad Pro (11-inch) (4th generation)')	1h 13m 56s
build (macos-15, release, 'iPhone 16')	11m 25s
build (macos-15, release, 'iPhone 16')	11m 25s
build (macos-15, release, 'iPad Air 11-inch (M2)')	9m 47s
build (macos-15, release, 'iPad Air 11-inch (M2)')	9m 47s
build (macos-15, debug, 'iPhone 16')	11m 12s
build (macos-15, debug, 'iPhone 16')	11m 12s
build (macos-15, debug, 'iPad Air 11-inch (M2)')	10m 56s
build (macos-15, debug, 'iPad Air 11-inch (M2)')	10m 56s
	5h 19m 43s

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