* Revised unknown chunk code to correct several bugs in the
NO_SAVE_/NO_WRITE combination
* Check user callback behavior in pngunknown.c. Previous versions
compiled if SAVE_UNKNOWN was not available but did nothing since the
callback was never implemented.
* Merged pngunknown.c with 1.7 version and back ported 1.7
improvements/fixes
* Revised pngvalid to generate size images with as many filters as
it can manage, limited by the number of rows.
* ARM improvements/fixes
OBS-URL: https://build.opensuse.org/package/show/graphics/libpng16?expand=0&rev=45