Add patch for failing i686 build.

OpenImageIO-1.7.7-i686_fix.patch

@@ -0,0 +1,11 @@
+--- a/src/libtexture/texturesys.cpp
++++ b/src/libtexture/texturesys.cpp
+@@ -2477,6 +2477,8 @@ TextureSystemImpl::sample_bicubic (int n
+         } else {
+             wx = evalBSplineWeights (float4(sfrac));
+             wy = evalBSplineWeights (float4(tfrac));
++            dwx = float4::Zero();
++            dwy = float4::Zero();
+         }
+ 
+         // figure out lerp weights so we can turn the filter into a sequence of lerp's

OpenImageIO.spec

@@ -14,6 +14,7 @@ Source0:        https://github.com/%{name}/%{subname}/archive/Release-%{version}
 # Images for test suite
 #Source1:        oiio-images.tar.gz
 
+Patch0:         OpenImageIO-1.7.7-i686_fix.patch
 
 BuildRequires:  cmake gcc-c++
 BuildRequires:  txt2man
@@ -96,6 +97,7 @@ Development files for package %{name}
 
 %prep
 %setup -q -n oiio-Release-%{version}
+%patch0 -p1
 
 # Remove bundled pugixml
 rm -f src/include/OpenImageIO/pugixml.hpp \