Remove "Auto fix bad Y levels on player login" patch

Fixes #6357
Closes #6508
Closes #6358

patches/server/0377-Allow-overriding-the-java-version-check.patch

@@ -0,0 +1,20 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Zach Brown <zach@zachbr.io>
+Date: Sat, 8 Feb 2020 18:02:24 -0600
+Subject: [PATCH] Allow overriding the java version check
+
+-DPaper.IgnoreJavaVersion=true
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/Main.java b/src/main/java/org/bukkit/craftbukkit/Main.java
+index 1da136f365664d4f8ace3d2d135b19eb97e55304..33fb61c219f5356a40c4e6e47187a3a606402536 100644
+--- a/src/main/java/org/bukkit/craftbukkit/Main.java
++++ b/src/main/java/org/bukkit/craftbukkit/Main.java
+@@ -185,7 +185,7 @@ public class Main {
+             }
+             if (javaVersion > 61.0) {
+                 System.err.println("Unsupported Java detected (" + javaVersion + "). Only up to Java 17 is supported.");
+-                return;
++                if (!Boolean.getBoolean("Paper.IgnoreJavaVersion")) return; // Paper
+             }
+ 
+             try {