Fix ImageDataUtil.copyPixels crash on Hashlink #1386

Job	Run time
docs	32s
air-samples (4.0.5)	3m 19s
android	26m 31s
air-samples (4.1.5)	3m 33s
flash-samples	37s
air-samples (4.2.5)	3m 38s
air-samples (4.3.1)	3m 45s
html5-samples	1m 27s
ios	20m 51s
linux	14m 48s
macos	31m 32s
windows	14m 32s
package-haxelib	2m 1s
hashlinkc-samples (windows-latest)	1m 48s
hashlink-samples (windows-latest)	53s
hashlinkc-samples (ubuntu-20.04)	1m 32s
neko-samples (3.4.7, windows-latest)	51s
hashlink-samples (ubuntu-20.04)	25s
hashlinkc-samples (macos-13)	2m 28s
neko-samples (3.4.7, ubuntu-20.04)	23s
hashlink-samples (macos-13)	49s
neko-samples (3.4.7, macos-13)	46s
neko-samples (4.2.5, windows-latest)	49s
neko-samples (4.2.5, ubuntu-20.04)	18s
neko-samples (4.2.5, macos-13)	51s
notify	0s
	2h 18m 59s

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