[source] zlib: Update to 1.2.9

[LEDE Commits]

jow pushed a commit to source.git, branch master:
https://git.lede-project.org/6099f22097dbbf923acd2f319933359a03e06ad5

commit 6099f22097dbbf923acd2f319933359a03e06ad5
Author: Daniel Engberg <daniel.engberg.lists at pyret.net>
AuthorDate: Mon Jan 2 21:22:13 2017 +0100

    zlib: Update to 1.2.9
    
    Update zlib to 1.2.9 and switch to XZ tarballs for download.
    
    Signed-off-by: Daniel Engberg <daniel.engberg.lists at pyret.net>
---
 package/libs/zlib/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/package/libs/zlib/Makefile b/package/libs/zlib/Makefile
index 3e20308..93c8115 100644
--- a/package/libs/zlib/Makefile
+++ b/package/libs/zlib/Makefile
@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=zlib
-PKG_VERSION:=1.2.8
+PKG_VERSION:=1.2.9
 PKG_RELEASE:=1
 
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=http://www.zlib.net @SF/libpng
-PKG_HASH:=36658cb768a54c1d4dec43c3116c27ed893e88b02ecfcb44f2166f9c0b7f2a0d
+PKG_HASH:=03d9c7f67976cf1389589782de46f45011053ea7f4222c2fb8c2cf9fd813bb68
 
 PKG_LICENSE:=Zlib
 PKG_LICENSE_FILES:=README