Install/Update libraries before building them

Just realized that when the admin-daily builders run, they have not updated the libraries for that night yet.

Admin daily runs at 00:10 https://github.com/compiler-explorer/infra/blob/master/crontab.admin#L8
and library install happens at 04:30 https://github.com/compiler-explorer/infra/blob/master/crontab.root.admin#L7

This is probably because the way it's set up for the compiler builders is; we build first and then we install those built versions. Which makes sense for those.
But the library builder uses the installed versions on /opt/

Install libraries should perhaps run at 0:08 ish?