Mostly 7zips the directory, all files must already be in place.
On Linux the script also fixes the Qt related RPATHs.

Changes the RPATH fixing to only change the Qt RPATH,
instead of overwriting the complete RPATH to something custom.

Change-Id: I1e07b7c0fcb4292197a4e743782a1392f6558747
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>