Add arm64 simulator target to iOS builds #40

Job	Run time
win-x64 Native Build	6m 54s
win-x86 Native Build	5m 18s
android-arm64-v8a Native Build	14m 4s
android-x86_64 Native Build	16m 44s
android-armeabi-v7a Native Build	16m 10s
linux-x64 Native Build	10m 48s
osx Native Build	10m 20s
ios Native Build	11m 39s
managed_build	2m 53s
	1h 34m 50s

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