dropme: override to build just two instead of all targets

Jenkinsfile

@@ -55,6 +55,7 @@ pipeline {
           script {
             def targets_string = sh(script: 'make list-targets', returnStdout: true)
             def targets = targets_string.tokenize('\n')
+            def targets = ['ath79-generic','ipq40xx-generic'] // override for testing purposes
             targets.each { target_name ->
               stage("Build ${target_name}") {
                 echo "${target_name}"