Bug 1687541 - Add libpng to libraries Updatebot can update; r=tjr,aosmond

Depends on D125337

Differential Revision: https://phabricator.services.mozilla.com/D104554

media/libpng/1737038.patch

@@ -1,7 +1,7 @@
 diff --git a/pngwutil.c b/pngwutil.c
---- a/media/libpng/pngwutil.c
-+++ b/media/libpng/pngwutil.c
-@@ -336,8 +336,10 @@ png_deflate_claim(png_structrp png_ptr, 
+--- a/pngwutil.c
++++ b/pngwutil.c
+@@ -336,8 +336,10 @@ png_deflate_claim(png_structrp png_ptr,
           if ((png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY) != 0)
              strategy = png_ptr->zlib_strategy;
  

media/libpng/MOZCHANGES

@@ -11,6 +11,10 @@ are Copyright (c) 2006-2007 Andrew Smith, Copyright (c) 2008-2017 Max Stepin,
 and are delimited by "#ifdef PNG_APNG_SUPPORTED / #endif" directives
 surrounding them in the modified libpng source files.
 
+2021/09/12  -- Enabled automatic updates via Updatebot (meta bug #1618282). For
+               further updates to the library please review the mercurial
+               history for /media/libpng/moz.yaml (bug #1687541).
+
 2019/04/15  -- Synced with libpng-1.6.37 (bug #1513236)
 
 2018/09/14  -- Synced with libpng-1.6.35 (bug #1491467).

media/libpng/moz.yaml

@@ -9,6 +9,55 @@ origin:
   description: "PNG reference library"
 
   url: "http://www.libpng.org/pub/png/libpng.html"
-  license: "libpng"
+  license: libpng
 
-  release: "1.6.37"
+  release: commit a40189cf881e9f0db80511c382292a5604c3c3d1 (2019-04-14T10:10:32:00Z).
+
+  revision: "v1.6.37"
+
+  license-file: LICENSE
+
+updatebot:
+  maintainer-phab: aosmond
+  maintainer-bz: aosmond@mozilla.com
+  tasks:
+    - type: vendoring
+      enabled: True
+
+vendoring:
+  url: https://github.com/glennrp/libpng
+  source-hosting: github
+  tracking: tag
+
+  exclude:
+    - "*"
+
+  include:
+    - arm
+    - contrib/arm-neon/linux.c
+    - intel
+    - mips
+    - powerpc
+    - ANNOUNCE
+    - AUTHORS
+    - CHANGES
+    - libpng-manual.txt
+    - LICENSE
+    - README
+    - TRADEMARK
+    - "*.c"
+    - "*.h"
+
+  keep:
+    - MOZCHANGES
+    - crashtests
+
+  update-actions:
+    - action: copy-file
+      from: 'contrib/arm-neon/linux.c'
+      to: 'arm/linux.c'
+    - action: delete-path
+      path: 'contrib'
+
+  patches:
+    - "*.patch"