9fa1c7c025dcd70d7e2ffab282cfb912ef9a5641 preprocessor: namespace fixes to remove clang warnings

================================ DYNARE MAKE CHECK MATLAB RESULTS ================================ | TOTAL: 413 | PASS: 411 | FAIL: 0 | XFAIL: 2 | XPASS: 0

================================ DYNARE MAKE CHECK OCTAVE RESULTS ================================ | TOTAL: 411 | PASS: 409 | FAIL: 0 | XFAIL: 2 | XPASS: 0

A full log can be found on karaba in '/tmp/dynare-4.4-check-WOrOocg4Ir.log'.