Getting ecm files from the ECM package

[Sune Vuorela]

On 2013-11-01, Mirko Boehm <mirko at kde.org> wrote:
> and so forth. That would be a real breakthrough. It is related to the approach taken by Maven and others. All it takes is a built-in way for CMake to download the find_modules into a cache location and update them when needed, or on request. 
>
> This would also make a lot of things a lot easier. For example, nobody would need to separately install ECM, and updates to our ECM packages can be delivered globally by commits to that repo. 

It also makes reproducible builds a lot harder. And our primary source
of distributing stuff is thru othe people's build servers with no
internet access.

/Sune