Fixed error in installing NDK 26 on CI #731

Job	Run time
linux-per-backend	5m 56s
linux-latest-dev	3m 25s
linux-oldest	3m 22s
android-sfml-graphics	2m 25s
ios-sdl	3m 30s
android-sdl	6m 28s
ios-sfml-graphics	49s
linux	4m 55s
macos	2m 3s
windows	3m 15s
windows-clang	5m 48s
windows-static-mt	5m 24s
windows-oldest	6m 39s
nightly-build-windows-visual-studio	6m 2s
	1h 0m 1s

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