Log Message:
jpeg: Update to 9d

Changelog:
Version 9d  12-Jan-2020
-----------------------

Optimize the optimal Huffman code table generation to produce
slightly smaller files.  Thank to John Korejwa for suggestion.
Note: Requires rebuild of testimgp.jpg.

Decoding Huffman: Use default tables if tables are not defined.
Thank to Simone Azzalin for report (Motion JPEG),
and to Martin Strunz for hint.

Add sanity check in optimal Huffman code table generation.
Thank to Adam Farley for suggestion.

rdtarga.c: use read_byte(), with EOF check, instead of getc()
in read_*_pixel().
Thank to Chijin Zhou for cjpeg potential vulnerability report.

jmemnobs.c: respect the max_memory_to_use setting in
jpeg_mem_available() computation.  Thank to Sheng Shu and
Dongdong She for djpeg potential vulnerability report.

jdarith.c, jdhuff.c: avoid left shift of negative value
compiler warning in decode_mcu_AC_refine().
Thank to Indu Bhagat for suggestion.

Add x64 (64-bit) platform support, avoid compiler warnings.
Thank to Jonathan Potter, Feiyun Wang, and Sheng Shu for suggestion.

Adjust libjpeg version specification for pkg-config file.
Thank to Chen Chen for suggestion.

Restore GIF read and write support from libjpeg version 6a.
Thank to Wolfgang Werner (W.W.) Heinz for suggestion.

Improve consistency in raw (downsampled) image data processing mode.
Thank to Zhongyuan Zhou for hint.

Avoid out of bounds array read (AC derived table pointers)
in start pass in jdhuff.c.  Thank to Peng Li for report.

Improve code sanity (jdhuff.c).
Thank to Reza Mirzazade farkhani for reports.

Add jpegtran -drop option; add options to the crop extension and wipe
to fill the extra area with content from the source image region,
instead of gray out.