gtkgreet-0.7-bp155.1.18

- Update to 0.7 This release includes the ability to style gtkgreet with
  stylesheets and background images, automatic gtk-layer-shell detection,
  and a few other improvements.
  * Fix --command argument for builds without layer-shell
  * Use layer-shell anchors to fill the screen
  * Add support for user CSS styles.
  * man changes for --style option
  * Convert -Dlayershell to 'feature'
  * Remove action_quit
  * Add support for background images
  * man: Document the background image flag
  * Remove gtk-application-prefer-dark-theme
  * ci: Disable automatic github mirroring
- workaround i586 build failure with CFLAGS for now (reported to author)

- Initial package gtkgreet version 0.6