[fix] create (empty) linkings.yml file

[haianos]

This solve an issue when running esrocos_build_project.
In fact, esrocos_build_project fails if no linkings.yml is found in the project's root folder.

[Kynneb]

This error which is fixed by this PR was introduced a while back, when in the CMakeLists.txt template the

esrocos_install_dependency_info()

has been commented out by default. This macro will create the (empty) linkings.yml on calling of amake. However I am intrigued if your proposal wouldn't be even smoother because it would make the (maybe counter-intuitive) use of this macro obsolete.

The error is adressed on master and stable branch of the buildconf right now, but I will play with this a bit the next week.

[haianos]

If you are fine with having always the linkings.yml file in the project folder, I would suggest my solution simply because it is there where you generate the esrocos.yml as well.
All esrocos_XXX_XXX commands (that you can apply on an existing project) do not work without esrocos.yml (to my understanding!). Currently, this is true also for linkings.yml once you call esrocos_build_project (or calling the generated build-script.sh manually).

Instead, if you have a good reason to do not have the linkings.yml in some edge-cases, then I would keep the current version.