No special Sexps for options/buffer calls in HAML
No special Sexps for options/buffer calls in HAML

Brakeman was generating invalid call Sexps with `:_hamlout`
as the target for `_hamlout.options` and `hamlout.buffer`.
However, these special Sexps were not really be handled in Brakeman
anywhere, and there was no real reason to make special Sexps for them.

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