cmake: don't undefine passed options

cmake/OpenCVUtils.cmake

@@ -603,11 +603,13 @@ macro(OCV_OPTION variable description value)
       option(${variable} "${description}" ${__value})
     endif()
   else()
-    if(DEFINED ${variable})
+    if(DEFINED ${variable} AND NOT OPENCV_HIDE_WARNING_UNSUPPORTED_OPTION)
-      # TODO: message(WARNING "Option will be ignored: ${variable} (=${${variable}})")
+      message(WARNING "Unexpected option: ${variable} (=${${variable}})\nCondition: IF (${__condition})")
     endif()
+    if(OPENCV_UNSET_UNSUPPORTED_OPTION)
       unset(${variable} CACHE)
     endif()
+  endif()
   unset(__condition)
   unset(__value)
 endmacro()