Fix ImageDataUtil.copyPixels crash on Hashlink #1385

Job	Run time
windows	14m 15s
linux	14m 15s
macos	25m 11s
air-samples (4.0.5)	2m 54s
android	24m 55s
air-samples (4.1.5)	3m 15s
docs	28s
flash-samples	35s
air-samples (4.2.5)	3m 5s
air-samples (4.3.1)	3m 24s
html5-samples	1m 16s
ios	19m 31s
package-haxelib	1m 54s
hashlink-samples (windows-latest)	50s
hashlinkc-samples (windows-latest)	1m 40s
hashlink-samples (ubuntu-20.04)	17s
neko-samples (3.4.7, windows-latest)	51s
hashlinkc-samples (ubuntu-20.04)	1m 40s
hashlink-samples (macos-13)	50s
neko-samples (3.4.7, ubuntu-20.04)	24s
hashlinkc-samples (macos-13)	1m 47s
neko-samples (3.4.7, macos-13)	39s
neko-samples (4.2.5, windows-latest)	43s
neko-samples (4.2.5, ubuntu-20.04)	25s
neko-samples (4.2.5, macos-13)	56s
notify	0s
	2h 6m 0s

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