pingus: update to 0.7.6

pkgsrc changes:
  * Disable configure target (SCons seems not to provide it)
  * Remove explicit use of SCons: use Makefile instead
  * Port deprecated Boost.Signals to Boost.Signals2
  * Take MAINTENERship

Changes:
Pingus 0.7.6 (24/Dec/2011)
==========================
* added new SVG icons for Pingus
* added 10 new xmas themed levels
* added ability to sort levelsets by priority

Pingus 0.7.5 (25/Oct/2011)
==========================
* fixed memory leak in OpenGL renderer
* added support for Win32 cross-compilation with mingw32
* added gamespeed adjustments via KPPlus, KPMinus, KPEnter
* added single-stepping the game with 'S'
* added better application icon
* added access to all levelsets in developer-mode (Ctrl-m)
* added 10 new Halloween levels

Pingus 0.7.4 (10/Oct/2011)
==========================
* fixed game not starting when no soundcard is present
* all halloween and tutorial levels have been converted to a minimum
  size of 1920x1200 so they can be played in fullscreen without letterboxing
* new --userdir command line switch to set the directory where savegames
  are saved
* menu getting confused by fast succedding clicks fixed
* level-demo recording and playback are back (files not compatible between x86 and x86-64)
* window resize support throughout the whole game
* dirty-rectangles drawing for improved performance with software rendering
* OpenGL rendering
* new blackboard graphic
* Unicode support
* two new levelsets, "Desert" and "Factory Campaign", with 27 new levels
* added a man-page
* deadly fall height has been increased
* support for prefab objects and groups in the editor
* cleaned up digger, miner and basher paths
* added an option menu
* lots of minor bug fixes
* bitmap fonts have been generated with anti-aliasing

(triaxx)