Fix ImageDataUtil.copyPixels crash on Hashlink #1384

Job	Run time
android	25m 32s
air-samples (4.0.5)	2m 55s
docs	37s
flash-samples	34s
air-samples (4.1.5)	3m 16s
html5-samples	1m 16s
air-samples (4.2.5)	3m 0s
ios	22m 14s
air-samples (4.3.1)	3m 31s
linux	14m 45s
macos	17m 0s
windows	14m 23s
package-haxelib	1m 50s
hashlinkc-samples (windows-latest)	2m 9s
hashlink-samples (windows-latest)	48s
neko-samples (3.4.7, windows-latest)	45s
hashlink-samples (ubuntu-20.04)	25s
hashlinkc-samples (ubuntu-20.04)	1m 35s
neko-samples (3.4.7, ubuntu-20.04)	15s
hashlink-samples (macos-13)	51s
hashlinkc-samples (macos-13)	1m 54s
neko-samples (3.4.7, macos-13)	37s
neko-samples (4.2.5, windows-latest)	48s
neko-samples (4.2.5, ubuntu-20.04)	17s
neko-samples (4.2.5, macos-13)	45s
notify	0s
	2h 2m 2s

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