BUG: FindPythonQt - Do not look for "util" library on apple platform

Utilities/CMake/FindPythonQt.cmake

@@ -18,7 +18,7 @@ MARK_AS_ADVANCED(PYTHONQT_INCLUDE_DIR)
 MARK_AS_ADVANCED(PYTHONQT_LIBRARY)
 
 # On linux, also find libutil
-IF(NOT WIN32)
+IF(UNIX AND NOT APPLE)
   FIND_LIBRARY(PYTHONQT_LIBUTIL util)
   MARK_AS_ADVANCED(PYTHONQT_LIBUTIL)
 ENDIF()