Log Message:
Update graphics/leptonica to 1.74.4.

1.74.4  11 Jun 17
- Converted two progs to reg tests
- New version because 1.74.3 had some spurious files (xtractprotos,
  endianness.h)

1.74.3  9 Jun 17
- Coverity scan fixes.
- Several fixes for running on Windows, including subtle one with tiff
  encoding depending on pad bits.
- Utility and test if a page image likely has a table.
- Remove use of pixCreateTemplateNoInit() where it may cause problems.
- Make release 'configure-make ready'