替换对 JDK 内置 Pack200 的依赖，允许在 JDK14 及更高版本上构建项目 (#904)

* fix: Pack200 has been removed

* Automatically add pack200 to class path

* add license header to Pack200Utils.java

build.gradle

@@ -25,6 +25,10 @@ subprojects {
         maven { url 'https://jitpack.io' }
     }
 
+    checkstyle {
+        sourceSets = []
+    }
+
     sourceCompatibility = 1.8
     compileJava.options.encoding = "UTF-8"
     compileTestJava.options.encoding = "UTF-8"