Fix directory-listing, directory-deletion and file deletion, when links are involved.

runtime/bin/file_win.cc

Index: runtime/bin/file_win.cc
diff --git a/runtime/bin/file_win.cc b/runtime/bin/file_win.cc
index 8e618d310a6490245edda2b1657ac5e2f7886aa4..3780fca056c2adf2f827ef271da4ae4ecf839228 100644
--- a/runtime/bin/file_win.cc
+++ b/runtime/bin/file_win.cc
@@ -259,12 +259,19 @@ bool File::CreateLink(const char* utf8_name, const char* utf8_target) {
 
 bool File::Delete(const char* name) {
   const wchar_t* system_name = StringUtils::Utf8ToWide(name);
-  int status = _wremove(system_name);
-  free(const_cast<wchar_t*>(system_name));
-  if (status == -1) {
-    return false;
+  DWORD attributes = GetFileAttributesW(system_name);
+  if ((attributes != INVALID_FILE_ATTRIBUTES) &&
+      (attributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0) {
+    // It's a junction(link), delete it.
+    return RemoveDirectoryW(system_name) != 0;
+  } else {
+    int status = _wremove(system_name);
+    free(const_cast<wchar_t*>(system_name));
+    if (status == -1) {
+      return false;
+    }
+    return true;
   }
-  return true;
 }