The first patch fixes a FATE issue with cICP and iCCP.

The second patch was discussed on IRC. I got a LGTM from Kasper, but sending to 
ML here and applying in a few days if there's no objections.

A few things discussed:
1) There's no need to expose the gamma table as another function as it's only 
used here.
2) This patch includes the patch on the ML sent as "avcodec/pngdec: warn when 
reading tv-range cICP chunks" which got a LGTM from Lynne on IRC. If this is 
applied that one has no need to be applied.

Changes from v2:
- Split off the gAMA chunk handling into a second patch at Andreas' suggestion.

Changes from v1:
- The second patch broke FATE because I didn't change the fate ref to 
accommodate the new metadata. I've since updated the fate reference.

Leo Izen (3):
  avcodec/pngenc: avoid writing cICP when inappropriate
  avcodec/pngdec: read colorspace info when decoding with AVDISCARD_ALL
  avcodec/pngdec: populate enum transfer values from gAMA chunk

 libavcodec/pngdec.c          | 128 +++++++++++++++++++++--------------
 libavcodec/pngenc.c          |  21 ++++--
 tests/ref/fate/png-icc       |   8 +--
 tests/ref/fate/png-side-data |   2 +-
 4 files changed, 96 insertions(+), 63 deletions(-)

-- 
2.39.1

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