Fix crash when EnumHelper can't find $VALUES field, log info, and return gracefully.

common/net/minecraftforge/classloading/FMLForgePlugin.java

@@ -6,6 +6,8 @@ import cpw.mods.fml.relauncher.IFMLLoadingPlugin;
 
 public class FMLForgePlugin implements IFMLLoadingPlugin
 {
+    public static boolean RUNTIME_DEOBF = false;
+
     @Override
     public String[] getLibraryRequestClass()
     {
@@ -36,5 +38,6 @@ public class FMLForgePlugin implements IFMLLoadingPlugin
     @Override
     public void injectData(Map<String, Object> data)
     {
+        RUNTIME_DEOBF = (Boolean)data.get("runtimeDeobfuscationEnabled");
     }
 }