Removed useless dependencies from common/file.h in common code. When complete removal was not possibile, dependency has been pushed to the cpp files from the headers.

Files:
modified: /scummvm/trunk/gui/theme.cpp (try)
modified: /scummvm/trunk/sound/mp3.cpp (try)
modified: /scummvm/trunk/graphics/dxa_player.cpp (try)
modified: /scummvm/trunk/sound/mods/infogrames.h (try)
modified: /scummvm/trunk/gui/theme.h (try)
modified: /scummvm/trunk/common/system.cpp (try)
modified: /scummvm/trunk/sound/mixer.cpp (try)
modified: /scummvm/trunk/sound/vorbis.cpp (try)
modified: /scummvm/trunk/graphics/dxa_player.h (try)
modified: /scummvm/trunk/sound/flac.cpp (try)
modified: /scummvm/trunk/sound/audiocd.cpp (try)
modified: /scummvm/trunk/sound/mods/infogrames.cpp (try)