cmake: fix comparison

Author: jcarpent

CMakeLists.txt

@@ -82,7 +82,7 @@ endif()
 set(PYTHON_EXPORT_DEPENDENCY ON)
 findpython(REQUIRED)
 
-if(NUMPY_VERSION VERSION_LESS "1.16.0")
+if(${NUMPY_VERSION} VERSION_LESS "1.16.0")
   set(NUMPY_WITH_BROKEN_UFUNC_SUPPORT)
 endif()