gnu: libpng: Update to 1.6.28.

* gnu/packages/image.scm (libpng): Update to 1.6.28.
[source]: Remove patch.
* gnu/packages/patches/libpng-CVE-2016-10087.patch: Remove file.
* gnu/local.mk (dist_patch_DATA): Remove it.

gnu/local.mk

@@ -685,7 +685,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/libmad-armv7-thumb-pt2.patch		\
   %D%/packages/patches/libmad-frame-length.patch		\
   %D%/packages/patches/libmad-mips-newgcc.patch			\
-  %D%/packages/patches/libpng-CVE-2016-10087.patch		\
   %D%/packages/patches/libssh-0.6.5-CVE-2016-0739.patch		\
   %D%/packages/patches/libtar-CVE-2013-4420.patch \
   %D%/packages/patches/libtheora-config-guess.patch		\

gnu/packages/image.scm

@@ -65,7 +65,7 @@
 (define-public libpng
   (package
    (name "libpng")
-   (version "1.6.25")
+   (version "1.6.28")
    (source (origin
             (method url-fetch)
             (uri (list (string-append "mirror://sourceforge/libpng/libpng16/"
@@ -76,9 +76,8 @@
                        (string-append
                         "ftp://ftp.simplesystems.org/pub/libpng/png/src/history"
                         "/libpng16/libpng-" version ".tar.xz")))
-            (patches (search-patches "libpng-CVE-2016-10087.patch"))
             (sha256
-             (base32 "04c8inn745hw25wz2dc5vll5n5d2gsndj01i4srwzgz8861qvzh9"))))
+             (base32 "0ylgyx93hnk38haqrh8prd3ax5ngzwvjqw5cxw7p9nxmwsfyrlyq"))))
    (build-system gnu-build-system)
 
    ;; libpng.la says "-lz", so propagate it.

gnu/packages/patches/libpng-CVE-2016-10087.patch

@@ -1,37 +0,0 @@
-Fix CVE-2016-10087, a null pointer dereference in png_set_text_2():
-
-https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10087
-http://seclists.org/oss-sec/2016/q4/777
-
-Patch adapted from upstream source repository:
-
-https://sourceforge.net/p/libpng/code/ci/812768d7a9c973452222d454634496b25ed415eb/
-
-From 812768d7a9c973452222d454634496b25ed415eb Mon Sep 17 00:00:00 2001
-From: Glenn Randers-Pehrson <glennrp at users.sourceforge.net>
-Date: Thu, 29 Dec 2016 07:51:33 -0600
-Subject: [PATCH] [libpng16] Fixed a potential null pointer dereference in
- png_set_text_2()
-
-(bug report and patch by Patrick Keshishian).
----
- ANNOUNCE | 2 ++
- CHANGES  | 2 ++
- png.c    | 1 +
- 3 files changed, 5 insertions(+)
-
-diff --git a/png.c b/png.c
-index 8afc28fc2..2e05de159 100644
---- a/png.c
-+++ b/png.c
-@@ -477,6 +477,7 @@ png_free_data(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_32 mask,
-          png_free(png_ptr, info_ptr->text);
-          info_ptr->text = NULL;
-          info_ptr->num_text = 0;
-+         info_ptr->max_text = 0;
-       }
-    }
- #endif
--- 
-2.11.0
-