Fix FTBFS on i686-linux due to rounding issue (see references).

Fixes Guix bug #22049 (see below).

Copied from Debian.

Source:
https://sources.debian.net/src/ilmbase/2.2.0-11/debian/patches/testBoxAlgo.patch/
https://sources.debian.net/src/ilmbase/2.2.0-11/debian/patches/testBox.patch/

References:
https://lists.nongnu.org/archive/html/openexr-devel/2015-12/msg00001.html
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22049
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=815712
https://anonscm.debian.org/cgit/pkg-phototools/ilmbase.git/commit/?id=ab28bb45cdad8adc32e345b777ab8e692b1d9a9c

---

Subject: testBoxAlgo: allow fuzzy match of b12 == b2
From: Steven Chamberlain <steven@pyro.eu.org>
Date: Wed, 24 Feb 2016 01:04:11 +0000

Also fix a pre-existing typo.

--- a/IlmBase/ImathTest/testBoxAlgo.cpp
+++ b/IlmBase/ImathTest/testBoxAlgo.cpp
@@ -886,10 +886,11 @@ boxMatrixTransform ()
 
     assert (approximatelyEqual (b2.min, b4.min, e));
     assert (approximatelyEqual (b2.max, b4.max, e));
-    assert (approximatelyEqual (b3.max, b4.max, e));
+    assert (approximatelyEqual (b3.min, b4.min, e));
     assert (approximatelyEqual (b3.max, b4.max, e));
 
-    assert (b21 == b2);
+    assert (approximatelyEqual (b2.min, b21.min, e));
+    assert (approximatelyEqual (b2.ma</td></tr></table>
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<tr><td><span title='2022-09-28 12:54:51 +0200'>2022-09-28</span></td><td><a href='/haketilo-hydrilla/commit/src/hydrilla/item_infos.py?h=v3.0-beta1&amp;id=8238435825d01ad2ec1a11b6bcaf6d9a9aad5ab5'>allow pulling packages from remote repository</a></td><td>Wojtek Kosior</td></tr>
<tr><td><span title='2022-09-28 12:54:22 +0200'>2022-09-28</span></td><td><a href='/haketilo-hydrilla/commit/src/hydrilla/item_infos.py?h=v3.0-beta1&amp;id=a36677eb70b92cf64fccb16075b7fec55660157f'>bring Hydrilla server part back to a usable state</a></td><td>Wojtek Kosior</td></tr>
<tr><td><span title='2022-09-28 12:54:13 +0200'>2022-09-28</span></td><td><a href='/haketilo-hydrilla/commit/src/hydrilla/item_infos.py?h=v3.0-beta1&amp;id=d54a95e0f9c689f2bbaaea90a3a16a855a408823'>allow loading packages from zip files through web UI and listing installed ma...</a></td><td>Wojtek Kosior</td></tr>
<tr><td><span title='2022-08-11 09:39:19 +0200'>2022-08-11</span></td><td><a href='/haketilo-hydrilla/commit/src/hydrilla/item_infos.py?h=v3.0-beta1&amp;id=3f3ba519ae3c3346945928b21ab36f7238e5387e'>save computed payloads into sqlite db</a></td><td>Wojtek Kosior</td></tr>
<tr><td><span title='2022-08-10 21:07:54 +0200'>2022-08-10</span></td><td><a href='/haketilo-hydrilla/commit/src/hydrilla/item_infos.py?h=v3.0-beta1&amp;id=72fcc76cc75ccb7e180886170db01dae637e250e'>small clean up for item definitions handling before dependency resolution hap...</a></td><td>Wojtek Kosior</td></tr>
<tr><td><span title='2022-08-10 17:25:05 +0200'>2022-08-10</span></td><td><a href='/haketilo-hydrilla/commit/src/hydrilla/item_infos.py?h=v3.0-beta1&amp;id=879c41927171efc8d77d1de2739b18e2eb57580f'>unfinished partial work</a></td><td>Wojtek Kosior</td></tr>
<tr><td><span title='2022-07-16 16:31:44 +0200'>2022-07-16</span></td><td><a href='/haketilo-hydrilla/commit/src/hydrilla/item_infos.py?h=v3.0-beta1&amp;id=52d12a4fa124daa1595529e3e7008276a7986d95'>unfinished partial work</a></td><td>Wojtek Kosior</td></tr>
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