Fixing some compiler warnings

Files:
modified: /scummvm/branches/gsoc2008-gui/gui/ThemeEngine.cpp (try)
modified: /scummvm/branches/gsoc2008-gui/gui/ThemeEngine.h (try)
modified: /scummvm/branches/gsoc2008-gui/gui/ThemeLayout.cpp (try)
modified: /scummvm/branches/gsoc2008-gui/graphics/VectorRendererSpec.h (try)
modified: /scummvm/branches/gsoc2008-gui/gui/ThemeLayout.h (try)