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='2022-01-11 14:48:00 -0500'>2022-01-11</span></td><td><a href='/guix/commit/.mailmap?id=7f779286df7e8636d901f4734501902cc934a72f'>Update mailmap.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Add entry for Zheng Junjie.
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<tr><td><span title='2021-11-06 16:03:43 +0100'>2021-11-06</span></td><td><a href='/guix/commit/.mailmap?id=567c4f4495fd1681bc6bd1ca3e9d1a87e120ac61'>Update mailmap and copyright assignments for Liliana Marie Prikler.</a><span class='msg-avail'>...<span class='msg-tooltip'>Use full names everywhere.

* .mailmap: Use full name for Liliana Marie Prikler.
* gnu/packages/zig.scm: Likewise.
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<tr><td><span title='2021-09-06 12:15:57 +0200'>2021-09-06</span></td><td><a href='/guix/commit/.mailmap?id=7158f8e4e9f81dbe004789018dcf06a5fe87d602'>Update mailmap.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Add entry for Liliana Marie Prikler.
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<tr><td><span title='2021-09-04 12:25:17 +0200'>2021-09-04</span></td><td><a href='/guix/commit/.mailmap?id=1fd0bf60ea261fac426052386029ead0ac68cad1'>Update mailmap.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Alias all my contributions to the same identity.
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<tr><td><span title='2021-07-27 12:34:56 -0400'>2021-07-27</span></td><td><a href='/guix/commit/.mailmap?id=c0e6e8d25e3750a35bebc80469ee86e7826bd769'>Update mailmap.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Add entry for Christine Lemmer-Webber.
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* gnu/packages/lisp-xyz.scm, gnu/packages/python-xyz.scm,
gnu/packages/rust.scm: Likewise.

Signed-off-by: Nicolas Goaziou &lt;mail@nicolasgoaziou.fr&gt;
</span></span></td><td>Matthew James Kraai</td></tr>
<tr><td><span title='2021-06-23 22:29:23 -0500'>2021-06-23</span></td><td><a href='/guix/commit/.mailmap?id=6d388103a4ed8f14f1ac6ac7a2ff22c5fa6b8cd4'>gnu: Add Sollya.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/algebra.scm (sollya): New variable.
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