[libgames-support] Note license problem with HistoryFileImporter.parse_date

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 761b2fe8dc94b5c0fb90d67c2f1053aab1d9be3f
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sun Feb 14 15:57:26 2016 -0600

    Note license problem with HistoryFileImporter.parse_date
    
    Must not have been thinking when I copied this over last night.

 games/scores/history-file-importer.vala |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/games/scores/history-file-importer.vala b/games/scores/history-file-importer.vala
index b3f5ea7..5094fa6 100644
--- a/games/scores/history-file-importer.vala
+++ b/games/scores/history-file-importer.vala
@@ -42,8 +42,10 @@ public class HistoryFileImporter : Importer
         };
     }
 
-    /* Copied from Robert's Vala games. This is useful for games to use when
-     * implementing their HistoryConvertFuncs.
+    /* Copied from Robert's Vala games (GPLv2+). This is useful for games to use
+     * when implementing their HistoryConvertFuncs.
+     *
+     * FIXME: GPLv2+, can't release with this.
      */
     public static DateTime? parse_date (string date)
     {