fix new gcc warnings

source/app/ldecod/configfile.c

source/app/ldecod/configfile.h

source/app/ldecod/defines.h

source/app/ldecod/image.c

source/app/ldecod/vlc.c

source/app/lencod/configfile.c

source/app/lencod/configfile.h

source/app/lencod/defines.h

source/app/lencod/global.h

source/app/lencod/img_dist_ms_ssim.h

source/app/lencod/img_distortion.h

source/app/lencod/lencod.c

source/app/lencod/parset.c

source/app/lencod/quant4x4_trellis.c

source/app/lencod/quantChroma_trellis.c

source/app/lencod/wp_lms.c

source/app/lencod/wp_lms.h

source/lib/lcommon/img_io.c

source/lib/lcommon/types.h