Log Message:
leptonica: updated to 1.76.0

1.76.0:
Modify infrastructure to fix outstanding security issues. By default,
  you can no longer create temp directories and temp files whose
  names are known to the compiler.  Also, prevent "system" calls,
  which were used for image display and gnuplot.
Replaced remaining sprintf() with snprintf() in prog tests.
Added non-transcoding functions for generating pdf from jpeg pixacomp
Add control of jpeg quality from pixWriteMem() and pixWriteStream()
Fixed getFilenamesInDirectory() to properly identify directories
Prevent size overflow in calloc for kernel; cleaned it up fpix and dpix
bmp reading now accepts negative height
Simplified splitimage2pdf; it no longer uses ps2pdf
Remove name-mangling WRITE_AS_NAMED compile option.
Removed 2 deprecated write functions.
Added these regression tests:
   locminmax_reg, speckle_reg, watershed_reg,