eina_file: fix unmap of unmapped region when Eina_File has copied data and not a...

eina_file: fix unmap of unmapped region when Eina_File has copied data and not a map;

Summary:
This was causing problems on non-Linux architectures as eina_file_real_close unmapped not mapped data. Added a "copied" flag to Eina_File which is set on eina_file_virtualize (on copied data), and tested for when eina_file_real_close does the unmap. I'm surprised Linux allowed this. Certainly all of the BSDs crashed with the previous behaviour.

@fix T5479

Test Plan: Example inlcude Rage and Enlightenment Thumb on BSD systems which use eina_file_virtualize with emotion to obtain album artwork.

Reviewers: raster, cedric, jpeg

Reviewed By: jpeg

Maniphest Tasks: T5479

Differential Revision: https://phab.enlightenment.org/D5006