[native_toolchain_c] Don't fail on uninstalled NDKs #1269

Job	Run time
build (ubuntu, stable, native_assets_builder, false)	6m 41s
build (ubuntu, stable, native_assets_cli, false)	2m 9s
build (ubuntu, stable, native_toolchain_c, false)	1m 52s
build (ubuntu, dev, native_assets_builder, false)	6m 32s
build (ubuntu, dev, native_assets_cli, false)	2m 28s
build (ubuntu, dev, native_toolchain_c, false)	2m 23s
build (macos, stable, native_assets_builder, false)	5m 32s
build (macos, stable, native_assets_cli, false)	1m 19s
build (macos, stable, native_toolchain_c, false)	1m 52s
build (macos, dev, native_assets_builder, false)	5m 1s
build (macos, dev, native_assets_cli, false)	1m 35s
build (macos, dev, native_toolchain_c, false)	1m 26s
build (windows, stable, native_assets_builder, false)	8m 46s
build (windows, stable, native_assets_cli, false)	3m 27s
build (windows, stable, native_toolchain_c, false)	6m 14s
build (windows, dev, native_assets_builder, false)	9m 23s
build (windows, dev, native_assets_cli, false)	3m 9s
build (windows, dev, native_toolchain_c, false)	4m 24s
coverage-finished	3s
	1h 14m 16s

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