Update physfs to 2.0.2, fixing the "missing" dreadfell bug

src/physfs/archivers/zip.c

src/physfs/physfs.c

src/physfs/physfs.h

src/physfs/physfs_internal.h

src/physfs/physfs_unicode.c

src/physfs/platform/posix.c

src/physfs/platform/unix.c

src/physfs/platform/windows.c