bootstrap: Add openssl configuration for x86_64-unknown-linux-gnux32

Author: glaubitz

src/bootstrap/native.rs

@@ -490,6 +490,7 @@ impl Step for Openssl {
             "x86_64-unknown-freebsd" => "BSD-x86_64",
             "x86_64-unknown-dragonfly" => "BSD-x86_64",
             "x86_64-unknown-linux-gnu" => "linux-x86_64",
+            "x86_64-unknown-linux-gnux32" => "linux-x32",
             "x86_64-unknown-linux-musl" => "linux-x86_64",
             "x86_64-unknown-netbsd" => "BSD-x86_64",
             _ => panic!("don't know how to configure OpenSSL for {}", target),