Following a119426 in the pg-vm-images repo [0] which installed libcurl in the
CI images we can now remove the installation commands from our Cirrus tasks.
The attached is a trivial diff which restores the Cirrus task file to the state
it was in before OAuth was committed.
--
Daniel Gustafsson
[0] https://github.com/anarazel/pg-vm-images/commit/a1194268391aca8665e26542af8d26646bdc520b
