remove obsolete code

Author: stlankes

src/libunwind/build.rs

@@ -43,8 +43,6 @@ fn main() {
         println!("cargo:rustc-link-lib=gcc_s");
     } else if target.contains("redox") {
         // redox is handled in lib.rs
-    } else if target.contains("hermit") {
-        //println!("cargo:rustc-link-lib=unwind");
     } else if target.contains("cloudabi") {
         println!("cargo:rustc-link-lib=unwind");
     }