Log Message:
libowfat: update to 0.33. Changes:

- add byte_start, byte_starts
- add a man page for byte_equal_notimingattack
- buffer_seek is no longer limited to the current buffer contents
- add automated way to run unit test: make check
- add parse.h
- add bytestream abstraction for parsing data from a buffer or a file
- add compiler.h to abstract gcc attributes
- add fmt_strm_malloc
- add cross references to open_* and mmap_* man pages
- add fmt_strm_alloca and fmt_strm_malloc man pages
- add buffer_init_allocbuf, buffer_init_read, buffer_init_write,
  buffer_init_read_allocbuf, buffer_init_write_allocbuf
- fix buffer overread for len=0 in scan_longn (Martin Castillo)
- add iob_write2 with sendfile callback so caller can use OpenSSL's
  SSL_sendfile