Add support for architecture armv8l

[schmidt9]

I installed a Debian image with architecture armv8l on Android device using Linux Deploy tool, xray installation fails due to unsupported architecture, could you please add this architecture support

[nihil-admirari]

Does Xray actually work if you were to run it manually? armv8l is a 32-bit mode of a 64-bit architecture. It may probably require arm32-v7a instead of arm64-v8a; but it's hard to tell without actual testing.