* Remove unused installation on macOS 10.10 as we only build packages
on 10.11.
* Replace the use of the ~1GB downloads of the zip files with a direct
extraction via NFS. This is more resilient to flakyness in the network
connection.
Change-Id: I1bfe5bbf00a6614233b517801daf130069094ec9
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@qt.io>