Revert "Merge pull request #650 from luacs1998/1.7.10"

This undoes the seriously broken change from Sponge to support Mixins, that breaks
a wide variety of coremods. Given the widespread incompatibility it introduces, it
won't be re-added at 1.7.10.

This reverts commit 8ccfa24764a3f4854f5334c0da1224286175e13b, reversing
changes made to 7c10b93a2ded2799d41b73b67a2766c31e992d8a.

fml/src/main/java/cpw/mods/fml/common/launcher/FMLServerTweaker.java

@@ -16,7 +16,6 @@ public class FMLServerTweaker extends FMLTweaker {
         // The mojang packages are excluded so the log4j2 queue is correctly visible from
         // the obfuscated and deobfuscated parts of the code. Without, the UI won't show anything
         classLoader.addClassLoaderExclusion("com.mojang.");
-        classLoader.addClassLoaderExclusion("org.objectweb.asm.");
         classLoader.addTransformerExclusion("cpw.mods.fml.repackage.");
         classLoader.addTransformerExclusion("cpw.mods.fml.relauncher.");
         classLoader.addTransformerExclusion("cpw.mods.fml.common.asm.transformers.");

fml/src/main/java/cpw/mods/fml/common/launcher/FMLTweaker.java

@@ -119,7 +119,6 @@ public class FMLTweaker implements ITweaker {
     {
         classLoader.addClassLoaderExclusion("org.apache.");
         classLoader.addClassLoaderExclusion("com.google.common.");
-        classLoader.addClassLoaderExclusion("org.objectweb.asm.");
         classLoader.addTransformerExclusion("cpw.mods.fml.repackage.");
         classLoader.addTransformerExclusion("cpw.mods.fml.relauncher.");
         classLoader.addTransformerExclusion("cpw.mods.fml.common.asm.transformers.");