redshift: Update to new upstream version 1.7.

Upstream release notes:

 - Add Geoclue location provider by Mathieu Trudel-Lapierre.
 - Allow brightness to be adjusted (-b).
 - Provide option to set color temperature directly (Joe Hillenbrand).
 - Add option to show program version (-V).
 - Add configure.ac option to install ubuntu icons. They will no longer
   be installed by default (Francesco Marella).
 - config: Look in %userprofile%/.config/redshift.conf on windows platform.
 - Fix: w32gdi: Obtain a new DC handle on every adjustment. This fixes a
   bug where redshift stops updating the screen.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>