Move ndk install to different step #840

Job	Run time
Linux-musl (travis-core-linux-musl)	1m 25s
Windows-visual-studio (Win32)	1m 56s
Linux-musl (travis-core-linux-musl-apicheck)	1m 22s
Android (21.4.7075529)	3m 8s
Linux-musl (travis-core-linux-musl-aarch64)	1m 25s
Linux-gcc-14	3m 30s
Android (16.1.4479499)	4m 34s
Android (26.1.10909125)	2m 13s
Windows-visual-studio (x64)	1m 45s
Mac-os	2m 0s
Windows-visual-studio (ARM)	1m 58s
Mac-os-aarch64	37s
Windows-visual-studio (ARM64)	1m 47s
Mac-os-cctools	2m 5s
Windows-mingw (win32)	1m 24s
Mac-os-aarch64-cctools	2m 8s
Windows-mingw (x64)	1m 31s
Mac-os-universal	14s
Mac-os-universal-cctools	11s
Notify-success	2s
	35m 15s

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