Introduce a new envvar (GALLIUM_HUD_DUMP_DIR) to write the displayed
hud values into files.

For example:
GALLIUM_HUD_DUMP_DIR="/tmp/" GALLIUM_HUD="fps,cpu+GPU-load" glxgears

In the /tmp directory it will create 3 files (fps, cpu and GPU-load)
with all the values inside.
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