Add patch to fix gcc 12 related FTBFS.

OCIO-strlen.patch

@@ -0,0 +1,12 @@
+Index: OpenColorIO-2.1.1/src/OpenColorIO/FileRules.cpp
+===================================================================
+--- OpenColorIO-2.1.1.orig/src/OpenColorIO/FileRules.cpp
++++ OpenColorIO-2.1.1/src/OpenColorIO/FileRules.cpp
+@@ -3,6 +3,7 @@
+ 
+ #include <algorithm>
+ #include <cctype>
++#include <cstring>
+ #include <map>
+ #include <regex>
+ #include <sstream>

OpenColorIO.spec

@@ -12,6 +12,8 @@ License:        BSD
 URL:            http://opencolorio.org/
 Source0:        https://github.com/AcademySoftwareFoundation/OpenColorIO/archive/v%{version}/%{name}-%{version}.tar.gz
 
+Patch0:         OCIO-strlen.patch
+
 # OIIO is only built for these arches due to Libraw
 %if 0%{?rhel} >= 8
 ExclusiveArch:  x86_64 ppc64le