Fix support for --headless. (#1090) #3340

Job	Run time
Build Ubuntu with Direct To Display	23m 14s
Build windows in Debug	39m 8s
Build windows in Release	41m 49s
Build Android in Debug	14m 16s
Build ubuntu in Debug	24m 54s
Build ios in Debug	13m 19s
Build ubuntu in Release	24m 30s
Build macos in Debug	26m 15s
Build macos in Release	26m 9s
	3h 53m 34s

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