HL didn't support threads in Haxe 3. #1267

Job	Run time
android	25m 38s
docs	29s
air-samples (4.0.5)	3m 3s
flash-samples	38s
air-samples (4.1.5)	5m 36s
html5-samples	1m 21s
air-samples (4.2.5)	3m 15s
ios	13m 49s
air-samples (4.3.1)	3m 10s
linux	14m 11s
macos	42m 12s
windows	14m 12s
package-haxelib	1m 27s
hashlink-samples (windows-latest)	42s
neko-samples (3.4.7, windows-latest)	45s
hashlinkc-samples (windows-latest)	1m 29s
neko-samples (3.4.7, ubuntu-20.04)	26s
hashlink-samples (ubuntu-20.04)	16s
hashlinkc-samples (ubuntu-20.04)	1m 30s
neko-samples (3.4.7, macos-12)	43s
hashlink-samples (macos-12)	52s
hashlinkc-samples (macos-12)	1m 54s
neko-samples (4.2.5, windows-latest)	40s
neko-samples (4.2.5, ubuntu-20.04)	17s
neko-samples (4.2.5, macos-12)	50s
notify	3s
	2h 19m 28s

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