Only make hardlinks prefixed

we don't need to worry about prefixing synlinks. Infact, we probably don't want that at all. symlinks can point to files that don't exist, and probably want to be more flexible for things like relative links anyway.

os.go

@@ -224,7 +224,11 @@ func decompressLoop(tr *tar.Reader, dest string) (err error) {
 			// see comment for the tar.TypeLink case above;
 			os.Remove(target)
 
-			err = os.Symlink(filepath.Join(dest, header.Linkname), target)
+			// we don't need to worry about prefixing synlinks. Infact,
+			// we probably don't want that at all. symlinks can point to
+			// files that don't exist, and probably want to be more flexible
+			// for things like relative links anyway
+			err = os.Symlink(header.Linkname, target)
 			if err != nil {
 				return
 			}