This reverts commit 7afa089db8b01b1810c5903309f7302545638550.
los_def is currently buggy, leading to weird behaviour when deleting exclusions.
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coord_def pos; // exclusion centre
int radius; // exclusion radius
bool autoexclude; // Was set automatically.
int mon; // Monster around which exclusion is centered.
los_def los; // los from exclusion centre
bool uptodate; // Is los up to date?
coord_def pos; // exclusion centre
int radius; // exclusion radius
bool autoexclude; // Was set automatically.
int mon; // Monster around which exclusion is centered.
env_show_grid show; // los from exclusion centre
bool uptodate; // Is show up to date?