交叉编译需要指定target选项，比如:

# in config.toml
[target.x86_64-unknown-linux-musl]
rustflags = [
    "-C", "linker-flavor=gcc", "-C", "link-self-contained=no",
]
# zig cc -target x86_64-linux-musl
linker = ".cargo/musl-zcc.bat"