[1.12] Cleanup of files with old licence headers, Add missing LGPL 2.1 licence headers (#4051)

src/main/java/net/minecraftforge/client/IRenderContextHandler.java

@@ -17,10 +17,6 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-/*
- * This software is provided under the terms of the Minecraft Forge Public
- * License v1.0.
- */
 package net.minecraftforge.client;
 
 public interface IRenderContextHandler