Log Message:
mate-polkit: update to 1.26.1

Change log:

### mate-polkit 1.26.1

  * Translations update
  * Fix segfault from gdk_x11_get_server_time if not on X11

### mate-polkit 1.26.0

  * Translations update
  * update copyright to 2021

### mate-polkit 1.25.0

  * Translations update
  * Remove USE_MATE2_MACROS from autogen.sh (legacy)
  * add git.mk to generate .gitignore
  * build: silent build warnings for distcheck