manifest: Track our own libpng

Necessary to apply patch for CVE-2019-7317

Change-Id: I8c02e55aa2b22f7996da1fc0121cf8e291eae8ae
1 file changed
tree: 3cc87bef27e8177dbe1c4f6d191aaa263bd6daf4
  1. snippets/
  2. default.xml
  3. README.mkdn