LuxCore needs to link with libOpenImageIO_Util starting with 2.3

[hobbes1069]

There was some redundant code in both the main and _Util library which was removed from the main library as of 2.3.0. Now LuxCore needs to link with the _Util library.

The following inelegant patch fixed the build for Fedora. Since I only built OIIO 2.3 in Fedora Rawhide I didn't need to do any version testing.

Index: LuxCore-luxcorerender_v2.5/cmake/Packages/FindOpenImageIO.cmake
===================================================================
--- LuxCore-luxcorerender_v2.5.orig/cmake/Packages/FindOpenImageIO.cmake
+++ LuxCore-luxcorerender_v2.5/cmake/Packages/FindOpenImageIO.cmake
@@ -55,6 +55,15 @@ FIND_LIBRARY(OPENIMAGEIO_LIBRARY
     lib64 lib x64/Release/lib
   )
 
+FIND_LIBRARY(OPENIMAGEIO_UTIL_LIBRARY
+  NAMES
+    OpenImageIO_Util
+  HINTS
+    ${_openimageio_SEARCH_DIRS}
+  PATH_SUFFIXES
+    lib64 lib x64/Release/lib
+  )
+
 # handle the QUIETLY and REQUIRED arguments and set OPENIMAGEIO_FOUND to TRUE if 
 # all listed variables are TRUE
 INCLUDE(FindPackageHandleStandardArgs)
@@ -62,7 +71,7 @@ FIND_PACKAGE_HANDLE_STANDARD_ARGS(OpenIm
     OPENIMAGEIO_LIBRARY OPENIMAGEIO_INCLUDE_DIR)
 
 IF(OPENIMAGEIO_FOUND)
-  SET(OPENIMAGEIO_LIBRARIES ${OPENIMAGEIO_LIBRARY})
+  SET(OPENIMAGEIO_LIBRARIES ${OPENIMAGEIO_LIBRARY} ${OPENIMAGEIO_UTIL_LIBRARY})
   SET(OPENIMAGEIO_INCLUDE_DIRS ${OPENIMAGEIO_INCLUDE_DIR})
 ENDIF(OPENIMAGEIO_FOUND)