Bug 648690 - Update libpng to version 1.5.9 (Mozilla changes). r=joedrew, f=dolske

configure.in

image/decoders/nsPNGDecoder.cpp

image/test/reftest/pngsuite-ancillary/cs3n2c16.html

image/test/reftest/pngsuite-background/bg__4a08.html

image/test/reftest/pngsuite-background/bg__4a16.html

image/test/reftest/pngsuite-background/bg__6a08.html

image/test/reftest/pngsuite-background/bg__6a16.html

image/test/reftest/pngsuite-background/reftest.list

image/test/reftest/pngsuite-basic-i/basi0g16.html

image/test/reftest/pngsuite-basic-i/basi2c16.html

image/test/reftest/pngsuite-basic-n/basn0g16.html

image/test/reftest/pngsuite-basic-n/basn2c16.html

image/test/reftest/pngsuite-chunkorder/color.html

image/test/reftest/pngsuite-chunkorder/grayscale.html

image/test/reftest/pngsuite-gamma/g03n0g16.html

image/test/reftest/pngsuite-gamma/g04n3p04.html

image/test/reftest/pngsuite-gamma/g05n0g16.html

image/test/reftest/pngsuite-gamma/g07n0g16.html

image/test/reftest/pngsuite-gamma/g10n0g16.html

image/test/reftest/pngsuite-gamma/g25n0g16.html