- fix postgresql_has_llvm usage

- switch to %{pg_name}-llvmjit-devel

- port to postgresql macros

- update to 1.4.1
* Fixes PostgreSQL 11- support

- update to 1.4.0
* Adds a cron.alter_job function to change job properties, by
Bertrand Drouvot
* Adds a cron.log_min_messages setting to control log_min_messages
in pg_cron launcher, by Bertrand Drouvot
* Adds a cron.enable_superuser_jobs setting to disallow superuser
jobs
* Fixes a bug that could cause jobs to hang when using
cron.use_background_workers, by Bertrand Drouvot
* Fixes a small memory allocation bug, by @mrdrivingduck
* PostgreSQL 14 is supported (no changes were needed)