Fix build with OpenEXR>=3

Index: cmake/modules/FindOpenEXR.cmake
--- cmake/modules/FindOpenEXR.cmake.orig
+++ cmake/modules/FindOpenEXR.cmake
@@ -52,14 +52,14 @@ if(OpenEXR_INCLUDE_DIR AND EXISTS "${OpenEXR_INCLUDE_D
     endif()
 endif()
 
-find_library(OpenEXR_LIBRARY NAMES IlmImf libIlmImf HINTS ${_OpenEXR_HINT_LIB})
+find_library(OpenEXR_LIBRARY NAMES OpenEXR libOpenEXR HINTS ${_OpenEXR_HINT_LIB})
 
 find_package(IlmBase QUIET)
 
 unset(_OpenEXR_HINT_INCLUDE)
 unset(_OpenEXR_HINT_LIB)
 
-set(OpenEXR_LIBRARIES ${OpenEXR_LIBRARY} ${IlmBase_LIBRARIES} )
+set(OpenEXR_LIBRARIES ${OpenEXR_LIBRARY} ${Imath_LIBRARIES} )
 set(OpenEXR_INCLUDE_DIRS ${OpenEXR_INCLUDE_DIR} )
 
 if(NOT PC_OPENEXR_FOUND)