Support target "x86_64-unknown-linux-gnu"

[hasezoey]

version used: git head 2c7dd81a304dc69362825c33d6219d666d987734 toolchain used: stable-x86_64-unknown-linux-gnu os: Linux Mint 20.2

Compile output

``` $ cargo build --release Downloaded gumdrop v0.8.0 Downloaded gumdrop_derive v0.8.0 Downloaded pretty_env_logger v0.4.0 Downloaded libc v0.2.97 Downloaded 4 crates (555.3 KB) in 0.68s Compiling proc-macro2 v1.0.27 Compiling unicode-xid v0.2.2 Compiling syn v1.0.73 Compiling memchr v2.4.0 Compiling libc v0.2.97 Compiling serde_derive v1.0.126 Compiling log v0.4.14 Compiling cfg-if v1.0.0 error[E0463]: can't find crate for `core` | = note: the `x86_64-unknown-linux-musl` target may not be installed = help: consider downloading the target with `rustup target add x86_64-unknown-linux-musl` error: aborting due to previous error For more information about this error, try `rustc --explain E0463`. error: could not compile `cfg-if` To learn more, run the command again with --verbose. warning: build failed, waiting for other jobs to finish... error: build failed ```

[Eraden]

It's supported but there is .cargo/config and default target is

[build]
target = "x86_64-unknown-linux-musl"

This target was chosen to make binary portable between different Linux distro

[Eraden]

Please compile using:

cargo build --release --target x86_64-unknown-linux-gnu