Merge pull request #14701 from alalek:update_libpng_1.6.37
authorAlexander Alekhin <alexander.a.alekhin@gmail.com>
Tue, 4 Jun 2019 09:19:25 +0000 (09:19 +0000)
committerAlexander Alekhin <alexander.a.alekhin@gmail.com>
Tue, 4 Jun 2019 09:19:26 +0000 (09:19 +0000)

Trivial merge