Update alttab to version 1.7.0 / rev 7 via SR 1070336
    
    https://build.opensuse.org/request/show/1070336
    by user jubalh + dimstar_suse
    - Update to 1.7.0:
      * Option -e to keep the switcher.
      * Document usage on mobile devices.
      * Configurable bordercolor.
      * Build scripts for OpenBSD.
      * Fix xpm icon bug.
      * Feature: kill window by pressing 'k'.
      * Feature: line at the bottom of tile.
      * Show windows on scratchpad only: -d 4
      * Disable icons: -s 4
      * Prevent segfault on zero size tile or icon.