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 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/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.

Index: ilmbase/ImathTest/testBoxAlgo.cpp
===================================================================
--- ilmbase.orig/ImathTest/testBoxAlgo.cpp
+++ 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.max, b21.max, e));
     assert (b31 == b3);
 
     M[0][3] = 1;