scons: use .get instead of [] for ARGUMENTS
Fixes getting a not helpful error message, and gives a helpful one instead.
Closes: #2003 (closed) Fixes: 54053bc8 ("scons: Print a deprecation warning about using scons on not windows")
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Fixes getting a not helpful error message, and gives a helpful one instead.
Closes: #2003 (closed) Fixes: 54053bc8 ("scons: Print a deprecation warning about using scons on not windows")