Update libpng to 1.6.20.

libpng <=1.6.19 has security vulnerabilities.
2015-12-26 14:06:34 +08:00 · 2015-12-26 14:06:34 +08:00 · 4260a91a99
parent 68f85587cb
commit 4260a91a99
1 changed files with 1 additions and 1 deletions
--- a/extlib/libpng
+++ b/extlib/libpng
@ -1 +1 @@
-Subproject commit 2b667e49232dd36aa7ea3a7382f265fd7f97d2cd
+Subproject commit 5b6a6f914b734f38d3ea96d70bfc67acd8b47414