graphics/lux: Update to 1.1.5

Upstream changes:

• EXIF metadata is now used to determine field of view
• panorama photographs from smartphone camera applications are no heuristically detected
• new config file ~/.lux.ini is evaluated
• many small improvements and bug fixes

Changelog: https://groups.google.com/g/hugin-ptx/c/bfX6Fu3mwy0/m/BNmUoqbnAAAJ