README: fix the name of the fetch_sources script
Signed-off-by: Martin Roukala martin.roukala@mupuf.org Fixes: c0af623d (use a local mesa copy to avoid re-cloning a repo ...)
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Signed-off-by: Martin Roukala martin.roukala@mupuf.org Fixes: c0af623d (use a local mesa copy to avoid re-cloning a repo ...)