Remove unpackJdks.gant

All usages on TeamCity were migrated to using `gradlew setupJdks` task

build/scripts/unpackJdks.gant

@@ -1,50 +0,0 @@
-/*
- * Copyright 2000-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import org.apache.tools.ant.BuildException
-
-target(default: "Unpack JDKs") {
-  def workingDirectory = getDependenciesProjectDir()
-  def gradleScript = System.getProperty('os.name').toLowerCase().contains('windows') ? "gradlew.bat" : "gradlew"
-  def process = new ProcessBuilder("${workingDirectory.absolutePath}/$gradleScript", 'setupJdks', '--stacktrace', '--info')
-    .directory(workingDirectory)
-    .start()
-  process.consumeProcessOutputStream((OutputStream)System.out)
-  process.consumeProcessErrorStream((OutputStream)System.err)
-  process.waitFor()
-  if (process.exitValue() != 0) {
-    throw new BuildException("Cannot unpack JDK")
-  }
-}
-
-private File getDependenciesProjectDir() {
-  String home = guessHome(this)
-  File community = new File(home, 'community')
-  return new File(community.exists() ? community : new File(home), "build/dependencies")
-}
-
-static String guessHome(Script script) {
-  File home = new File(script["gant.file"].substring("file:".length()))
-
-  while (home != null) {
-    if (home.isDirectory()) {
-      if (new File(home, ".idea").exists()) return home.getCanonicalPath()
-    }
-
-    home = home.getParentFile()
-  }
-
-  return null
-}