Change-Id: Ib14c08b8a6e5c2d33d8c1bb1839ff2d72516038e

Change-Id: I2a0be54cbb62e5a4b2d938c07932864aa2646f6d

This enables the bKGD (background color) feature and time conversion
utilities which are used by cairo. Specifically this flips the
following defines on:

PNG_CONVERT_tIME_SUPPORTED
PNG_bKGD_SUPPORTED
PNG_tIME_SUPPORTED

Change-Id: I59396acd54c760d2f28b3159973993b3676c5c4c

Changes described in README.fuchsia

Change-Id: Idd810e11e7a07f4a1f8049e4914c0227f9b1d7d5

Updated contrib/intel/intel_sse.patch

I didn't intend to distribute this but it leaked into the libpng16 source,
so here it is.

only one filter is a candidate for selection. This trades off code size (added
png_setup_*_row_only() functions) for speed.

The fixed size buffer for the file name being processed could have a byte
written beyond the end; a bug where the test was updated without changing the
size of the buffer.  This commit reduces the buffer to the system maximum.

png_getrowbytes could, in theory, return 0; probably only if there is a bug in
libpng but the code now checks.

Signed-off-by: John Bowler <jbowler@acm.org>

In libpng 1.7 pngimage needs to check PNG_WRITE_PNG_SUPPORTED (new in 1.7), not
PNG_WRITE_SUPPORTED because png_write_png can be disabled without disabling
PNG_WRITE_SUPPORTED.  Copied the approach from 1.6 pngcp.c (so this still works
in 1.6 as well.)