Find & document a way to enable devs to keep the natives they compile themselves for testing/coding

[fmarot]

When developping, devs may compile a new version of a native lib containing new code under test. We should find and document the best way for this dev to keep this lib without the "nativedependencies-maven-plugin" overwriting this lib each time.

[fmarot]

Additional info: problem arise if when the CI pushed updated native builds everyday, but the dev wants to keep working with his own hand-compiled .so/.dll. So building his local project may trigger the overwrite.
One way could be to tell him to just use offline Maven (mvn -o).
Another way would be to write (manually, or at least independantly from the nativedependencies plugin) a 'warning' flag in the json file in /taget/natives so that the nativedependencies plugin knows he should not do anything or at least not overwrite a specific lib.