Log Message:
Update games/wesnoth to 1.12.6

Changes:
Version 1.12.6:
 * Campaigns:
   * Legend of Wesmere:
     * Fixed recruit lists for AI sides in MP mode.
     * Made it so the campaign displays an error and aborts when started with
       Shuffle Sides enabled in MP mode.
 * Language and i18n:
   * Updated translations: British English, Galician, Italian, Japanese,
     Portuguese, RACV, Russian, Scottish Gaelic, Slovak, Spanish, Swedish
 * Terrains:
   * Fixed glitches of river ford transitions.
 * User interface:
   * GUI1 comboboxes now use the thinner menu frame style.
   * Fixed minimap buttons appearing without contents or in the wrong state
     when the game window is resized, when using debug commands to toggle fog
     and/or shroud, and probably a lot of other occurrences that are now
     covered by a proper fix on top of the quick hacks shipped with versions
     1.11.16 and 1.12.3.
   * Fixed MP lobby games list coming up empty when Invert is checked while
     Apply Filter is not (bug #23117).
   * Fixed Observers icon appearing behind other top bar items in MP games on
     horizontal UI resolutions < 1024 (bug #24455).
   * Fixed ToD schedule progress indicator appearing behind other top bar items
     on vertical UI resolutions < 600.
 * Miscellaneous and bug fixes:
   * Revert all updates to hot-key handling which broke letter-based short-cuts
     on non-US keyboard layouts, where characters are in different key
     locations (bug #24186).
   * Fix the move-to-targets candidate action of the default AI ignoring tunnels
   * Fix two rare bugs in the goto candidate action that resulted in goto moves
     by other units being skipped after a unit could not get to its goal.
   * Fixed possible assertion failures in multiplayer.
   * Fixed false positive OOS messages in replay when replaying games from an
     older Wesnoth version.
   * Fixed saving the game during a replay creating corrupt saves (bug #23310).
   * Fixed unit test compilation against Boost 1.60 and later (bug #24234).