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

src/lib/eina/eina_file.c

@@ -295,7 +295,7 @@ eina_file_real_close(Eina_File *file)
         free(map);
      }
 
-   if (file->global_map != MAP_FAILED)
+   if (!file->copied && file->global_map != MAP_FAILED)
      munmap(file->global_map, file->length);
 
    if (file->fd != -1) close(file->fd);

src/lib/eina/eina_file_common.c

@@ -448,6 +448,7 @@ eina_file_virtualize(const char *virtual_name, const void *data, unsigned long l
 
    if (copy)
      {
+        file->copied = EINA_TRUE;
         file->global_map = ((char *)file) + head_padded;
         memcpy((char *)file->global_map, data, length);
      }

src/lib/eina/eina_file_common.h

@@ -102,6 +102,7 @@ struct _Eina_File
    Eina_Bool delete_me : 1;      /**< Indicates that this file should be deleted */
    Eina_Bool global_faulty : 1;  /**< Indicates whether #global_map is bad */
    Eina_Bool virtual : 1;        /**< Indicates that this is a virtual file */
+   Eina_Bool copied : 1;         /**< Indicates whether this file has copied data */
 };
 
 /**