[OMPD] The LLVM OMPD library writes to stdout, but that is not allowed

[jdelsign]

The LLVM OMPD writes to stdout via a "dout" stream defined in Debug.h, but that is not allowed by the OMPD v5.0 spec. The following is one example: https://github.com/OpenMPToolsInterface/LLVM-openmp/blob/ompd-devices/libompd/src/TargetValue.cpp#L62

The library should not be writing to stdout, and instead should be using "ompd_callback_print_string_fn_t print_string;" in the "ompd_callbacks_t" structure.