Update FindOpenImageIO.cmake to support newer OIIO versions

Newer OIIO version has split the library in two.
The regular library and an utils library.

The regular library depends on the  utils library, so we need to include
it as well if it is found.

common/cmake/FindOpenImageIO.cmake

@@ -53,6 +53,7 @@ SET(OPENIMAGEIO_HINTS
   )
 SET(OPENIMAGEIO_PATHS PATHS /usr/lib /usr/lib64 /lib /lib64)
 FIND_LIBRARY(OPENIMAGEIO_LIBRARY OpenImageIO ${OPENIMAGEIO_HINTS} ${OPENIMAGEIO_PATHS})
+FIND_LIBRARY(OPENIMAGEIO_UTIL_LIBRARY OpenImageIO_Util ${OPENIMAGEIO_HINTS} ${OPENIMAGEIO_PATHS})
 
 SET(OPENIMAGEIO_ROOT_LAST ${OPENIMAGEIO_ROOT} CACHE INTERNAL "Last value of OPENIMAGEIO_ROOT to detect changes")
 
@@ -68,8 +69,9 @@ FIND_PACKAGE_HANDLE_STANDARD_ARGS(OpenImageIO
 
 IF (OPENIMAGEIO_FOUND)
   SET(OPENIMAGEIO_INCLUDE_DIRS ${OPENIMAGEIO_INCLUDE_DIR})
-  SET(OPENIMAGEIO_LIBRARIES ${OPENIMAGEIO_LIBRARY})
+  SET(OPENIMAGEIO_LIBRARIES ${OPENIMAGEIO_LIBRARY} ${OPENIMAGEIO_UTIL_LIBRARY})
 ENDIF()
 
 MARK_AS_ADVANCED(OPENIMAGEIO_INCLUDE_DIR)
 MARK_AS_ADVANCED(OPENIMAGEIO_LIBRARY)
+MARK_AS_ADVANCED(OPENIMAGEIO_UTIL_LIBRARY)