New comment by jnbr on void-packages repository

https://github.com/void-linux/void-packages/issues/12058#issuecomment-497944240
Comment:
here is a workaround to use a fixed (working) version of libc:

```
--- a/srcpkgs/cargo/template
+++ b/srcpkgs/cargo/template
@@ -100,6 +100,9 @@ do_build() {
                cargo="./cargo"
        fi

+       $cargo update
+       $cargo update --package libc --precise 0.2.55
+
        $cargo build --release $(vopt_if static --features="all-static")
 }
```