Revert "Update Assimp lib for Linux"

This reverts commit 0fcd6a194a.

Source/ThirdParty/assimp/assimp.Build.cs

@@ -37,6 +37,7 @@ public class assimp : DepsModule
         case TargetPlatform.Linux:
         case TargetPlatform.Mac:
             options.OutputFiles.Add(Path.Combine(depsRoot, "libassimp.a"));
+            options.OutputFiles.Add(Path.Combine(depsRoot, "libIrrXML.a"));
             break;
         default: throw new InvalidPlatformException(options.Platform.Target);
         }