Merge branch 'ilufang-osufs' into ilufang

osufs/.gitignore

osufs/libpng/CHANGES

osufs/libpng/LICENSE

osufs/libpng/README

osufs/libpng/png.c

osufs/libpng/png.h

osufs/libpng/pngconf.h

osufs/libpng/pngdebug.h

osufs/libpng/pngerror.c

osufs/libpng/pngget.c

osufs/libpng/pnginfo.h

osufs/libpng/pnglibconf.h

osufs/libpng/pngmem.c

osufs/libpng/pngpread.c

osufs/libpng/pngpriv.h

osufs/libpng/pngread.c

osufs/libpng/pngrio.c

osufs/libpng/pngrtran.c

osufs/libpng/pngrutil.c

osufs/libpng/pngset.c