Jenkinsfile: Add back workaround for license error

This time it is a bit smarter and trigger the licenses deploiement only
when it is really missing. This should avoid too long build time.

BugzID: 69247

Jenkinsfile

@@ -182,6 +182,9 @@ def build(env_in, image_type_in, single_fitImage) {
   if (single_fitImage) {
     sh "bash -c '. ./env.image${env} && bitbake -k virtual/netmodule-image'"
   } else {
+    /* The following workaround can be removed once the explanation for the missing lic has been found */
+    if (! fileExists("build/tmp/deploy/licenses/ostree-kernel-initramfs"))
+      sh "bash -c '. ./env.image${env} && bitbake -fc populate_lic ostree-kernel-initramfs'"
     sh "bash -c '. ./env.image${env} && bitbake -k netmodule-linux-image${image_type}'"
   }
 }