DO NOT MERGE Update libpng to 1.6.20

BUG:23265085
Change-Id: I85199805636d771f3597b691b63bc0bf46084833
(cherry picked from commit bbe98b40cda082024b669fa508931042eed18f82)
diff --git a/tests/pngunknown-save b/tests/pngunknown-save
index ae84930..21412c4 100755
--- a/tests/pngunknown-save
+++ b/tests/pngunknown-save
@@ -1,2 +1,2 @@
 #!/bin/sh
-exec ./pngunknown default=save "${srcdir}/pngtest.png"
+exec ./pngunknown --strict default=save "${srcdir}/pngtest.png"