Disable building the feature/pgtk branch

* configure.ac: Add notice that feature/pgtk has been
integrated into master.
1 job for feature/pgtk in 4 minutes and 11 seconds (queued for 16 seconds)
Status Job ID Name Coverage
  Build Images
failed #36015


Name Stage Failure
build-image-inotify Build Images
executor failed running [/bin/sh -c ./configure]: exit code: 1
Running after_script
Running after script...
$ test -n "$(docker ps -aq -f name=${test_name})" && docker cp ${test_name}:checkout/test ${test_name}
$ test -n "$(docker ps -aq -f name=${test_name})" && docker rm ${test_name}
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
find: build-image-inotify-8627f735: No such file or directory
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1