[UIMA-6451] Jenkins builds should run against multiple platforms

- Try without "def" as per https://issues.jenkins.io/browse/JENKINS-65292?focusedCommentId=409735&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-409735
diff --git a/vars/defaultPipeline.groovy b/vars/defaultPipeline.groovy
index de54fd1..c034d2d 100644
--- a/vars/defaultPipeline.groovy
+++ b/vars/defaultPipeline.groovy
@@ -18,9 +18,9 @@
   under the License.
 */
 def call(body) {
-  def config = createConfiguration(body)
+  config = createConfiguration(body)
   
-  def labelValue = (params.agentLabel ?:config.agentLabel)?.trim()
+  labelValue = (params.agentLabel ?:config.agentLabel)?.trim()
   
   pipeline {
     parameters {