Migration todo: proj4 macro is deprecated about navitia

[kinnou02]

Sadly the new API is only available in proj 5 that isn't available in debian 8 that is still a target of navitia.
Once we drop support for debian 8 we will be able to migrate to the new api.

[crocme10]

add_definitions("-DACCEPT_USE_OF_DEPRECATED_PROJ_API_H")

[pbougue]

As discussed aside, it looks like it's an issue related to the compiling on an archlinux platform.
We can either clarify things a bit and add it to a doc or an install script for arch (we have to find where).
Or we can just track here troubleshooting information (and probably close the issue once it's done).

@riendegris I let you precise/edit your comments according to what's best for you (and for anyone new to the issue 😉 )

[kinnou02]

It's a bit more complex than that, new version of proj have disabled support for the API we are using, next version will drop it, this will catch us some day.
The point of this issue is to track it, and if possible migrate to the new api.

[azime]

Corrected in this PR 3289