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='2020-10-02 14:58:01 +0200'>2020-10-02</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=d6a8f0a9781a90c3037f25e51d7ff32e50f7a8c1'>services: cuirass: Fix activation.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes: &lt;https://issues.guix.gnu.org/43760&gt;.

* gnu/services/cuirass.scm (cuirass-activation): Do not create
queries-log-file and web-queries-log-file if the corresponding config file are
unset.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-09-24 13:51:57 +0200'>2020-09-24</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=a024eedb1c0a537aa236fa27fe7a94ba6aa3d76c'>services: cuirass: Create queries log files at activation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/cuirass.scm (cuirass-activation)[queries-log-file]: Create and
set user permissions on "queries-log-file" and "web-queries-log-file".
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-09-24 11:28:59 +0200'>2020-09-24</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=80e26d74294d40f311f61d13996f1ed1aa4d8edd'>services: cuirass: Add web SQL queries logging support.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/cuirass.scm (&lt;cuirass-configuration&gt;)[web-queries-log-file]:
New field.
(cuirass-shepherd-service): Honor it.
(cuirass-log-rotations): If defined, add the web queries log file to the log
rotation.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-09-24 10:47:22 +0200'>2020-09-24</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=92e507c963470c6086a59ca8e1dd58ed4403649c'>services: cuirass: Add SQL queries logging support.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/cuirass.scm (&lt;cuirass-configuration&gt;)[queries-log-file]: New
field.
(cuirass-shepherd-service): Honor it.
(cuirass-log-rotations): If defined, add the queries log file to the log
rotation.
</span></span></td><td>Mathieu Othacehe</td></tr>