add listxattr/getxattr/setxattr/removexattr on Linux and Android#1847

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SteveLauC wants to merge 4 commits intonix-rust:masterfrom

SteveLauC:xattr-syscalls-on-Android-and-Linux

Commits on Oct 14, 2022

Commits on Oct 15, 2022

change interface of getxattr/setxattr and their variants since EA value is just a sequence of arbitrary bytes
SteveLauC
committed