Fix CVE-2016-5296: Heap-buffer-overflow WRITE in rasterize_edges_1
Adapted for upstream pixman based on:

  https://hg.mozilla.org/releases/mozilla-esr45/rev/5e39c1c2fded

--- pixman-0.34.0/pixman/pixman-edge-imp.h.orig	2015-06-30 05:48:31.000000000 -0400
+++ pixman-0.34.0/pixman/pixman-edge-imp.h	2016-11-16 01:09:34.046335106 -0500
@@ -55,8 +55,9 @@
 	 *
 	 * (The AA case does a similar  adjustment in RENDER_SAMPLES_X)
 	 */
-	lx += X_FRAC_FIRST(1) - pixman_fixed_e;
-	rx += X_FRAC_FIRST(1) - pixman_fixed_e;
+	/* we cast to unsigned to get defined behaviour for overflow */
+	lx = (unsigned)lx + X_FRAC_FIRST(1) - pixman_fixed_e;
+	rx = (unsigned)rx + X_FRAC_FIRST(1) - pixman_fixed_e;
 #endif
 	/* clip X */
 	if (lx < 0)
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<tr><td><span title='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/aspell.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a><span class='msg-avail'>...<span class='msg-tooltip'>This commit was obtained by running:

  ./pre-inst-env guix style

without any additional argument.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-06-05 18:29:55 +0200'>2021-06-05</span></td><td><a href='/guix/commit/gnu/packages/aspell.scm?id=c6e36ee2dc570ee5c636ebee0561f989c66912e0'>gnu: ispell: Update to 3.4.04.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/aspell.scm (ispell): Update to 3.4.04.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-06-02 15:40:03 +0200'>2021-06-02</span></td><td><a href='/guix/commit/gnu/packages/aspell.scm?id=1bd85824c7a04e8c77bb2ba31c310975664c7a53'>gnu: ispell: Update to 3.4.03.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/aspell.scm (ispell): Update to 3.4.03.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-05-18 17:20:27 +0200'>2021-05-18</span></td><td><a href='/guix/commit/gnu/packages/aspell.scm?id=be528eb53d6c5c6d3ef7d74a02da2e2b97c0ccc6'>gnu: hunspell-dict-en &amp; variants: Make reproducible.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/aspell.scm (aspell-word-list)[arguments]: Add a new
'make-reproducible phase.

Fixes &lt;http://issues.guix.gnu.org/48499&gt;.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-05-06 22:16:23 +0200'>2021-05-06</span></td><td><a href='/guix/commit/gnu/packages/aspell.scm?id=0c495a0d23225847526c6256adec95cf2b02860f'>gnu: aspell-dict-en: Update to 2020.12.07-0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/aspell.scm (aspell-dict-en): Update to 2020.12.07-0.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-04-30 12:51:40 +0200'>2021-04-30</span></td><td><a href='/guix/commit/gnu/packages/aspell.scm?id=847f523381f79e46d151257bf5f9a636a85db8ac'>gnu: Add aspell-dict-ro.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/aspell.scm (aspell-dict-ro): New variable.

Signed-off-by: Julien Lepiller &lt;julien@lepiller.eu&gt;
</span></span></td><td>Sergiu Ivanov</td></tr>