gnu: pixman: Update to 0.32.8.

* gnu/packages/xdisorg.scm (pixman): Update to 0.32.8.
* gnu/packages/patches/pixman-pointer-arithmetic.patch: Remove.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.

gnu-system.am

@@ -589,7 +589,6 @@ dist_patch_DATA =						\
   gnu/packages/patches/perl-tk-x11-discover.patch		\
   gnu/packages/patches/pidgin-add-search-path.patch		\
   gnu/packages/patches/pingus-sdl-libs-config.patch		\
-  gnu/packages/patches/pixman-pointer-arithmetic.patch		\
   gnu/packages/patches/plotutils-libpng-jmpbuf.patch		\
   gnu/packages/patches/polkit-drop-test.patch			\
   gnu/packages/patches/portaudio-audacity-compat.patch		\

gnu/packages/patches/pixman-pointer-arithmetic.patch

@@ -1,15 +0,0 @@
-Fix <https://bugs.freedesktop.org/show_bug.cgi?id=92027> whereby
-an arithemitic overflow could occur while doing pointer arithmetic,
-leading pixman to use an invalid address as the destination buffer.
-
---- pixman-0.32.6/pixman/pixman-general.c	2015-09-21 15:14:34.695981325 +0200
-+++ pixman-0.32.6/pixman/pixman-general.c	2015-09-21 15:19:48.898355548 +0200
-@@ -144,8 +144,7 @@ general_composite_rect  (pixman_implemen
-     mask_buffer = ALIGN (src_buffer + width * Bpp);
-     dest_buffer = ALIGN (mask_buffer + width * Bpp);
- 
--    if (ALIGN (dest_buffer + width * Bpp) >
--	    scanline_buffer + sizeof (stack_scanline_buffer))
-+    if ((width + 1) * Bpp * 3 > sizeof (stack_scanline_buffer))
-     {
- 	scanline_buffer = pixman_malloc_ab_plus_c (width, Bpp * 3, 32 * 3);

gnu/packages/xdisorg.scm

@@ -171,24 +171,21 @@ following the mouse.")
 (define-public pixman
   (package
     (name "pixman")
-    (version "0.32.6")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (string-append
-               "http://cairographics.org/releases/pixman-"
-               version
-               ".tar.gz"))
-        (sha256
-          (base32
-           "0129g4zdrw5hif5783li7rzcr4vpbc2cfia91azxmsk0h0xx3zix"))
-        (patches (list (search-patch "pixman-pointer-arithmetic.patch")))))
+    (version "0.32.8")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "http://cairographics.org/releases/pixman-"
+                    version ".tar.gz"))
+              (sha256
+               (base32
+                "0pfn0247sjsi95kwjih0wwqpp28wadihqk1bn28x6iqbqhbxwnjp"))))
     (build-system gnu-build-system)
     (inputs
-      `(("libpng" ,libpng)
-        ("zlib" ,zlib)))
+     `(("libpng" ,libpng)
+       ("zlib" ,zlib)))
     (native-inputs
-      `(("pkg-config" ,pkg-config)))
+     `(("pkg-config" ,pkg-config)))
     (home-page "http://www.pixman.org/")
     (synopsis "Low-level pixel manipulation library")
     (description "Pixman is a low-level software library for pixel