Add a benchmark for a simple audio chain; easier than profiling all of Nageru.

[nageru] / .gitignore

*.d
*.o
*.moc.cpp
ui_aboutdialog.h
ui_audio_expanded_view.h
ui_audio_miniview.h
ui_display.h
ui_input_mapping.h
ui_mainwindow.h
nageru
benchmark_audio_mixer