Vendor dependencies for 0.3.0 release

vendor/same-file/examples/is_same_file.rs

@@ -0,0 +1,11 @@
+use same_file::is_same_file;
+use std::io;
+
+fn try_main() -> Result<(), io::Error> {
+    assert!(is_same_file("/bin/sh", "/usr/bin/sh")?);
+    Ok(())
+}
+
+fn main() {
+    try_main().unwrap();
+}