Remove mojang netty hack

Ultimately, people break this anyway when they really want to.
And the breakage is a source of irregularities and problems.

Like people customizing versions while they should update instead.

generateMojang.py

@@ -55,6 +55,10 @@ for filename in os.listdir('upstream/mojang/versions'):
             mmcLib = MultiMCLibrary(lib.to_json())
             specifier = mmcLib.name
             ruleHash = None
+            # ignore the mojang netty hack that prevents connection to select servers they don't like
+            if specifier.isMojangNetty():
+                print("Ignoring Mojang netty hack in version", versionFile.version)
+                continue
             if specifier.isLwjgl():
                 rules = None
                 if mmcLib.rules:

metautil.py

@@ -49,6 +49,9 @@ class GradleSpecifier:
     def isLwjgl(self):
         return self.group in ("org.lwjgl.lwjgl", "net.java.jinput", "net.java.jutils")
 
+    def isMojangNetty(self):
+        return self.group == "com.mojang" and self.artifact == "netty"
+
     def __lt__(self, other):
         return self.toString() < other.toString()