Use of invalid OUTPUTS named parameter in add_custom_command

[eyalroz]

In blitz/CMakeLists.txt it says:

     add_custom_command(
        COMMAND $<TARGET_FILE:${prog}>
         TARGET  ${header}
         WORKING_DIRECTORY ${PROJECT_BINARY_DIR}/blitz/generate
        OUTPUTS ${header}
     )

but there is no OUTPUTS. There is the OUTPUT named parameter, but you actually don't need that when we have TARGET. So the OUTPUTS should just be dropped.