Move/copy legacy docs build to a separate directory

libraries/tools/kotlin-stdlib-docs-legacy/ant/build.gradle

@@ -0,0 +1,30 @@
+apply plugin: 'de.undercouch.download'
+apply plugin: 'base'
+
+final String ext
+if (System.getProperty('os.name', '').toLowerCase().contains('windows')) {
+    ext = ".bat"
+} else {
+    ext = ""
+}
+
+
+final String antVersion = "1.10.12"
+final String antURL = "https://cache-redirector.jetbrains.com/downloads.apache.org/ant/binaries/apache-ant-$antVersion-bin.zip"
+final File antHome = new File(buildDir, "ant-home")
+final File antZip = new File(buildDir, "apache-ant-$antVersion-bin.zip")
+final File antExe = new File(antHome, "apache-ant-$antVersion/bin/ant$ext")
+
+task downloadAnt(type: Download) {
+    src antURL
+    dest antZip
+    overwrite false
+}
+
+task extractAnt(type: Sync, dependsOn: downloadAnt) {
+    from zipTree(antZip)
+    into antHome
+}
+
+project.extensions.ant_exe = antExe
+