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/GuiMana.cpp

@@ -305,8 +305,8 @@ void GuiMana::Render()
     for (vector<ManaIcon*>::iterator it = manas.begin(); it != manas.end(); ++it)
         (*it)->Render();
 
-        if (OptionManaDisplay::DYNAMIC != options[Options::MANADISPLAY].number && OptionManaDisplay::NOSTARSDYNAMIC != options[Options::MANADISPLAY].number )
-        RenderStatic();
+    if (OptionManaDisplay::DYNAMIC != options[Options::MANADISPLAY].number && OptionManaDisplay::NOSTARSDYNAMIC != options[Options::MANADISPLAY].number )
+    RenderStatic();
 }
 
 bool remove_dead(ManaIcon* m)