Build: Fix jrunscript command to quote correctly on windows (#23539)

As noted
in https://github.com/elastic/elasticsearch/issues/22898#issuecomment-277192425

buildSrc/src/main/groovy/org/elasticsearch/gradle/BuildPlugin.groovy

@@ -203,6 +203,7 @@ class BuildPlugin implements Plugin<Project> {
     /** Runs the given javascript using jjs from the jdk, and returns the output */
     private static String runJavascript(Project project, String javaHome, String script) {
         ByteArrayOutputStream output = new ByteArrayOutputStream()
+        script = script.replace('"', '\\"') // gradle/groovy does not properly escape the double quote for windows
         project.exec {
             executable = new File(javaHome, 'bin/jrunscript')
             args '-e', script