Fix linking neon-runtime on windows.

-l is only intended to communicate the names of libraries

See rust-lang/rust#38850 for more details.

crates/neon-runtime/build.rs

@@ -2,6 +2,7 @@ extern crate gcc;
 
 use std::process::Command;
 use std::env;
+use std::path::Path;
 
 fn main() {
     // 1. Build the object file from source using node-gyp.
@@ -58,7 +59,10 @@ fn build_object_file() {
             .map(|i| i + node_lib_file_flag_pattern.len())
             .expect("Couldn't find node_lib_file in node-gyp output.");
         let node_lib_file_end_index = node_gyp_output[node_lib_file_start_index..].find(".lib").unwrap() + node_lib_file_start_index;
-        println!("cargo:node_lib_file={}", &node_gyp_output[node_lib_file_start_index..node_lib_file_end_index]);
+        let node_lib_file = &node_gyp_output[node_lib_file_start_index..node_lib_file_end_index];
+        let file = Path::new(node_lib_file);
+        println!("cargo:rustc-link-search=native={}", file.parent().unwrap().display());
+        println!("cargo:rustc-link-lib={}", file.file_name().unwrap().to_str().unwrap());
     }
 
     // Run `node-gyp build`.