linuxManualConfig: don't mangle `--build-id`
linuxManualConfig: don't mangle `--build-id`

In order to have our linux builds be reproducible we patch the
`Makefile` to use `--build-id=none` as opposed to the default
`--build-id=sha1`. The way we've been doing this, however, caused the
flag to be mangled, and being set to `--build-id=none=sha1`. While bfd
seems to parse this normally, lld will loudly complain that the flag
does not exist:

```
linux>   LD      .tmp_vmlinux.kallsyms1
linux> ld.lld: error: unknown --build-id style: none=sha1
```

With this change the flag is now correctly set to `--build-id=none`.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs