Fix/framework headers workaround

Closed Julien Wadel requested to merge fix/framework_headers_workaround into release/4.3

Using Frameworks on MacOs is not fully supported for Linphone : this will copy headers for unix-style using and framework-style using.

Link at e0bd711eee11e04cce28bb55de712c69ec3b2a0e Merge link at 580

Edited by Julien Wadel

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