[Bug 1524328] Re: libpng 1.6 support

[LocutusOfBorg]

It is now time to start the libpng1.6 transition.
A lot of packages will be built automatically on the auto import open, so we really should have libpng-dev provided by libpng1.6 before that time.

todolist:
1) accept my libpng1.6 sync (currently in unapproved)
2) merge my lp: #1573415 bug (old libpng without the libpng-dev provides string)
3) sync/merge gdk-pixbuf on top of the new libpng1.6
(and maybe wxwidgets3.0/webkitgtk/webkit2gtk/qtbase-opensource-src)
4) let auto-import fix many of the dependencies
5) finish the transition

of course I can do all the -universe -multiverse stuff, hopefully main
has just a few packages depending on libpng-dev

** Changed in: libpng (Ubuntu)
   Importance: Medium => High

** Summary changed:

- libpng 1.6 support
+ libpng 1.6 transition

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Title:
  libpng 1.6 transition

Status in libpng package in Ubuntu:
  Confirmed

Bug description:
  As said, in Debian it is pretty much in place, and I sync'd/merged almost every package in Ubuntu too.
  Would it be possible to have the transition done for Xenial?

  I can fix stuff in Universe, but not in Main (there is not many
  packages there AFAICS)

  this is the debian bug
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650601

  you can start from this message:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650601#691

  thanks!

  Gianfranco
  ----

  Libpng 1.6 has been out for a little while, apparently it has some
  important fixes for pngquant (which is also in Ubuntu).  There are
  comments here that maybe useful:
  https://github.com/pornel/pngquant/blob/master/rwpng.c

  Presumably at some point libpng1.2 will be EOL so we'll need to
  upgrade anyhow!

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