Log Message:
mate-power-manager: update 1.21.1:

### mate-power-manager 1.21.1

  * Translations update
  * disable deprecation warnings for distcheck
  * gpm-control: avoid deprecated 'g_settings_list_schemas'
  * media-keys: always round the render coordinates for media icons
  * media-keys: Tweak the OSD's bright bar position
  * osd-window: make the window smaller
  * media-keys: Make icon smaller in OSD
  * media-keys: Use constant for icon size in OSD
  * Fix spelling and grammar mistakes
  * Use make functions for HELP_LINGUAS
  * add m-p-m user-guide to transifex config
  * gpm-kbd-backlight: replace deprecated GDK_DEVICE_MANAGER
  * gpm-backlight: replace deprecated GDK_DEVICE_MANAGER
  * gpm-button: replace deprecated Gdk functions
  * gpm-brightness: replace deprecated Gdk functions

### mate-power-manager 1.21.0

  * Translations update
  * inhibit: always scale icon to match panel size
  * Inhibit Applet: Fix excessive CPU use
  * add missing window icon to About dialogs
  * Scale OSD size correctly on HiDPI displays (#246)
  * Grammar fix