X11 build fixups

- fixed -Werror=misleading-indentation warning
- fixed -Werror=nonnull-compare warning on xll and QT builds
- PNG_LIBPNG_VER backward compatibily changes
- giflib backward compatibily changes
- resolved some undefs for X11 build
- silenced some small compile warnings in JGE Makefile
- added -DTIXML_USE_STL to remaining build types (PSP had it added)
- fixed x11 Boost incompatibility issue part of #548
- reworked PrecompiledHeader.h platforms used

projects/mtg/src/MTGAbility.cpp

@@ -5371,7 +5371,7 @@ int ActivatedAbility::isReactingToClick(MTGCardInstance * card, ManaCost * mana)
     case OPPONENT_TURN_ONLY:
         if (player == game->currentPlayer)
             return 0;
-            break;
+        break;
     case AS_SORCERY:
         if (player != game->currentPlayer)
             return 0;
@@ -5543,7 +5543,7 @@ int ActivatedAbility::activateAbility()
             ExtraCost * tapper = dynamic_cast<TapCost*>(cost->extraCosts->costs[i]);
             if(tapper)
                 needsTapping = 1;
-                wasTappedForMana = true;
+            wasTappedForMana = true;
         }
     }
     else if(amp||femp)