Libpng 1.6.31

Version 1.6.31beta01 [July 5, 2017]
Guard the definition of _POSIX_SOURCE in pngpriv.h (AIX already defines it;
bug report by Michael Felt).
Revised pngpriv.h to work around failure to compile arm/filter_neon.S
("typedef" directive is unrecognized by the assembler). The problem
was introduced in libpng-1.6.30beta01.
Added "Requires: zlib" to libpng.pc.in (Pieter Neerincx).
Added special case for FreeBSD in arm/filter_neon.S (Maya Rashish).

Version 1.6.31beta02 [July 8, 2017]
Added instructions for disabling hardware optimizations in INSTALL.
Added "--enable-hardware-optimizations" configuration flag to enable
or disable all hardware optimizations with one flag.

Version 1.6.31beta03 [July 9, 2017]
Updated CMakeLists.txt to add INTEL_SSE and MIPS_MSA platforms.
Changed "int" to "png_size_t" in intel/filter_sse2.c to prevent
possible integer overflow (Bug report by John Bowler).
Quieted "declaration after statement" warnings in intel/filter_sse2.c.
Added scripts/makefile-linux-opt, which has hardware optimizations enabled.

Version 1.6.31beta04 [July 11, 2017]
Removed one of the GCC-7.1.0 'strict-overflow' warnings that result when
integers appear on both sides of a compare. Worked around the others by
forcing the strict-overflow setting in the relevant functions to a level
where they are not reported (John Bowler).
Changed "FALL THROUGH" comments to "FALLTHROUGH" because GCC doesn't like
the space.
Worked around some C-style casts from (void*) because g++ 5.4.0 objects
to them.
Increased the buffer size for 'sprint' to pass the gcc 7.1.0 'sprint
overflow' check that is on by default with -Wall -Wextra.

Version 1.6.31beta05 [July 13, 2017]
Added eXIf chunk support.

Version 1.6.31beta06 [July 17, 2017]
Added a minimal eXIf chunk (with Orientation and FocalLengthIn35mmFilm
tags) to pngtest.png.

Version 1.6.31beta07 [July 18, 2017]
Revised the eXIf chunk in pngtest.png to fix "Bad IFD1 Directory" warning.

Version 1.6.31rc01 [July 19, 2017]
No changes.

Version 1.6.31rc02 [July 25, 2017]
Fixed typo in example.c (png_free_image should be png_image_free) (Bug
report by John Smith)

Version 1.6.31 [July 27, 2017]
No changes.

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