*** IMPORTANT ***
Updating libpng in GDAL tree should follow update of zlib library in frmts/zlib.
*****************

libpng 1.6.43 is the official PNG reference library.
It supports almost all PNG features, is extensible,
and has been extensively tested for over 20 years.

http://www.libpng.org


GDAL changes
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* Make screwy MSPaint "zero chunks" only a warning, not error. See r18808 and #3416 (stored in libpng_gdal.patch)
* Modification of pnglibconf.h to allow rename symbols (stored in pnglibconf.h.patch)
