Don't crash on failed temp dir cleanup

tools/files.js

@@ -633,7 +633,14 @@ files.freeTempDir = function (tempDir) {
     // ignores all ENOENT calls. And we don't remove tempDir from tempDirs until
     // it's done, so that if mid-way through this rm_recursive the onExit one
     // fires, it still gets removed.
-    files.rm_recursive(tempDir);
+    try {
+      files.rm_recursive(tempDir);
+    } catch (err) {
+      // Don't crash and print a stack trace because we failed to delete a temp
+      // directory. This happens sometimes on Windows and seems to be
+      // unavoidable.
+      Console.debug(err);
+    }
     tempDirs = _.without(tempDirs, tempDir);
   });
 };